31426481 has 4 divisors (see below), whose sum is σ = 31540212. Its totient is φ = 31312752.

The previous prime is 31426477. The next prime is 31426511. The reversal of 31426481 is 18462413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7612081 + 23814400 = 2759^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 31426481 - 2² = 31426477 is a prime.

It is a super-2 number, since 2×31426481² = 1975247416086722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31426411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56450 + ... + 57003.

It is an arithmetic number, because the mean of its divisors is an integer number (7885053).

Almost surely, 2^31426481 is an apocalyptic number.

It is an amenable number.

31426481 is a deficient number, since it is larger than the sum of its proper divisors (113731).

31426481 is a wasteful number, since it uses less digits than its factorization.

31426481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113730.

The product of its digits is 4608, while the sum is 29.

The square root of 31426481 is about 5605.9326610297. The cubic root of 31426481 is about 315.5720887810.

Adding to 31426481 its reverse (18462413), we get a palindrome (49888894).

The spelling of 31426481 in words is "thirty-one million, four hundred twenty-six thousand, four hundred eighty-one".