401225531 has 4 divisors (see below), whose sum is σ = 458543472. Its totient is φ = 343907592.

The previous prime is 401225519. The next prime is 401225533. The reversal of 401225531 is 135522104.

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

It is not a de Polignac number, because 401225531 - 2¹⁰ = 401224507 is a prime.

It is a super-2 number, since 2×401225531² = 321963853452463922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401225497 and 401225506.

It is not an unprimeable number, because it can be changed into a prime (401225533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28658960 + ... + 28658973.

It is an arithmetic number, because the mean of its divisors is an integer number (114635868).

Almost surely, 2^401225531 is an apocalyptic number.

401225531 is a deficient number, since it is larger than the sum of its proper divisors (57317941).

401225531 is an equidigital number, since it uses as much as digits as its factorization.

401225531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57317940.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 401225531 is about 20030.6148432843. The cubic root of 401225531 is about 737.5580150091.

Adding to 401225531 its reverse (135522104), we get a palindrome (536747635).

The spelling of 401225531 in words is "four hundred one million, two hundred twenty-five thousand, five hundred thirty-one".