401091651 has 12 divisors (see below), whose sum is σ = 590286528. Its totient is φ = 262348944.

The previous prime is 401091637. The next prime is 401091703. The reversal of 401091651 is 156190104.

401091651 is a `hidden beast` number, since 4 + 0 + 1 + 0 + 9 + 1 + 651 = 666.

It is not a de Polignac number, because 401091651 - 2¹¹ = 401089603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (401091631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419955 + ... + 420908.

It is an arithmetic number, because the mean of its divisors is an integer number (49190544).

Almost surely, 2^401091651 is an apocalyptic number.

401091651 is a deficient number, since it is larger than the sum of its proper divisors (189194877).

401091651 is a wasteful number, since it uses less digits than its factorization.

401091651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840922 (or 840919 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 401091651 is about 20027.2726800231. The cubic root of 401091651 is about 737.4759703365.

The spelling of 401091651 in words is "four hundred one million, ninety-one thousand, six hundred fifty-one".