401552491 has 2 divisors, whose sum is σ = 401552492. Its totient is φ = 401552490.

The previous prime is 401552471. The next prime is 401552581. The reversal of 401552491 is 194255104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401552491 - 2¹⁹ = 401028203 is a prime.

It is a super-2 number, since 2×401552491² = 322488806056610162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401552471) 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 as a sum of consecutive naturals, namely, 200776245 + 200776246.

It is an arithmetic number, because the mean of its divisors is an integer number (200776246).

Almost surely, 2^401552491 is an apocalyptic number.

401552491 is a deficient number, since it is larger than the sum of its proper divisors (1).

401552491 is an equidigital number, since it uses as much as digits as its factorization.

401552491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 401552491 is about 20038.7746880891. The cubic root of 401552491 is about 737.7583067606.

The spelling of 401552491 in words is "four hundred one million, five hundred fifty-two thousand, four hundred ninety-one".