401511535531 has 2 divisors, whose sum is σ = 401511535532. Its totient is φ = 401511535530.

The previous prime is 401511535487. The next prime is 401511535541. The reversal of 401511535531 is 135535115104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401511535531 - 2²⁹ = 400974664619 is a prime.

It is a super-2 number, since 2×401511535531² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401511535541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200755767765 + 200755767766.

It is an arithmetic number, because the mean of its divisors is an integer number (200755767766).

Almost surely, 2^401511535531 is an apocalyptic number.

401511535531 is a deficient number, since it is larger than the sum of its proper divisors (1).

401511535531 is an equidigital number, since it uses as much as digits as its factorization.

401511535531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 401511535531 in words is "four hundred one billion, five hundred eleven million, five hundred thirty-five thousand, five hundred thirty-one".