401606251 has 4 divisors (see below), whose sum is σ = 412460512. Its totient is φ = 390751992.

The previous prime is 401606221. The next prime is 401606267. The reversal of 401606251 is 152606104.

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 401606251 - 2²⁷ = 267388523 is a prime.

It is a super-2 number, since 2×401606251² = 322575161684550002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401606221) 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, 5427075 + ... + 5427148.

It is an arithmetic number, because the mean of its divisors is an integer number (103115128).

Almost surely, 2^401606251 is an apocalyptic number.

401606251 is a deficient number, since it is larger than the sum of its proper divisors (10854261).

401606251 is a wasteful number, since it uses less digits than its factorization.

401606251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10854260.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 401606251 is about 20040.1160425782. The cubic root of 401606251 is about 737.7912290788.

The spelling of 401606251 in words is "four hundred one million, six hundred six thousand, two hundred fifty-one".