401552581 has 2 divisors, whose sum is σ = 401552582. Its totient is φ = 401552580.

The previous prime is 401552491. The next prime is 401552587. The reversal of 401552581 is 185255104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201895681 + 199656900 = 14209^2 + 14130^2 .

It is a cyclic number.

It is not a de Polignac number, because 401552581 - 2¹⁹ = 401028293 is a prime.

It is a super-2 number, since 2×401552581² = 322488950615523122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401552587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200776290 + 200776291.

It is an arithmetic number, because the mean of its divisors is an integer number (200776291).

Almost surely, 2^401552581 is an apocalyptic number.

It is an amenable number.

401552581 is a deficient number, since it is larger than the sum of its proper divisors (1).

401552581 is an equidigital number, since it uses as much as digits as its factorization.

401552581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 401552581 is about 20038.7769337353. The cubic root of 401552581 is about 737.7583618785.

The spelling of 401552581 in words is "four hundred one million, five hundred fifty-two thousand, five hundred eighty-one".