401506531 has 4 divisors (see below), whose sum is σ = 403827552. Its totient is φ = 399185512.

The previous prime is 401506529. The next prime is 401506543. The reversal of 401506531 is 135605104.

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

It is a cyclic number.

It is not a de Polignac number, because 401506531 - 2¹ = 401506529 is a prime.

It is a super-2 number, since 2×401506531² = 322414988871307922, 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 = 401506496 and 401506505.

It is not an unprimeable number, because it can be changed into a prime (401506591) 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, 1160251 + ... + 1160596.

It is an arithmetic number, because the mean of its divisors is an integer number (100956888).

Almost surely, 2^401506531 is an apocalyptic number.

401506531 is a deficient number, since it is larger than the sum of its proper divisors (2321021).

401506531 is a wasteful number, since it uses less digits than its factorization.

401506531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321020.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 401506531 is about 20037.6278785689. The cubic root of 401506531 is about 737.7301587880.

The spelling of 401506531 in words is "four hundred one million, five hundred six thousand, five hundred thirty-one".