401868651 has 4 divisors (see below), whose sum is σ = 535824872. Its totient is φ = 267912432.

The previous prime is 401868619. The next prime is 401868683. The reversal of 401868651 is 156868104.

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

It is an interprime number because it is at equal distance from previous prime (401868619) and next prime (401868683).

It is not a de Polignac number, because 401868651 - 2⁵ = 401868619 is a prime.

It is a super-2 number, since 2×401868651² = 322996825313119602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401868251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66978106 + ... + 66978111.

It is an arithmetic number, because the mean of its divisors is an integer number (133956218).

Almost surely, 2^401868651 is an apocalyptic number.

401868651 is a deficient number, since it is larger than the sum of its proper divisors (133956221).

401868651 is a wasteful number, since it uses less digits than its factorization.

401868651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133956220.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 401868651 is about 20046.6618418130. The cubic root of 401868651 is about 737.9518791929.

The spelling of 401868651 in words is "four hundred one million, eight hundred sixty-eight thousand, six hundred fifty-one".