312401521 has 4 divisors (see below), whose sum is σ = 315267700. Its totient is φ = 309535344.

The previous prime is 312401513. The next prime is 312401549. The reversal of 312401521 is 125104213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125104213 = 13 ⋅9623401.

It can be written as a sum of positive squares in 2 ways, for example, as 127441521 + 184960000 = 11289^2 + 13600^2 .

It is a cyclic number.

It is not a de Polignac number, because 312401521 - 2³ = 312401513 is a prime.

It is a super-2 number, since 2×312401521² = 195189420646226882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312401501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1432926 + ... + 1433143.

It is an arithmetic number, because the mean of its divisors is an integer number (78816925).

Almost surely, 2^312401521 is an apocalyptic number.

It is an amenable number.

312401521 is a deficient number, since it is larger than the sum of its proper divisors (2866179).

312401521 is a wasteful number, since it uses less digits than its factorization.

312401521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866178.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 312401521 is about 17674.8839034377. The cubic root of 312401521 is about 678.5331131575.

Adding to 312401521 its reverse (125104213), we get a palindrome (437505734).

It can be divided in two parts, 31240 and 1521, that added together give a square (32761 = 181²).

The spelling of 312401521 in words is "three hundred twelve million, four hundred one thousand, five hundred twenty-one".