401251663 has 4 divisors (see below), whose sum is σ = 424854720. Its totient is φ = 377648608.

The previous prime is 401251661. The next prime is 401251667. The reversal of 401251663 is 366152104.

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

It is not a de Polignac number, because 401251663 - 2¹ = 401251661 is a prime.

It is a super-2 number, since 2×401251663² = 322005794120531138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401251661) 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 in 3 ways as a sum of consecutive naturals, for example, 11801503 + ... + 11801536.

It is an arithmetic number, because the mean of its divisors is an integer number (106213680).

Almost surely, 2^401251663 is an apocalyptic number.

401251663 is a deficient number, since it is larger than the sum of its proper divisors (23603057).

401251663 is a wasteful number, since it uses less digits than its factorization.

401251663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23603056.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 401251663 is about 20031.2671341580. The cubic root of 401251663 is about 737.5740271570.

The spelling of 401251663 in words is "four hundred one million, two hundred fifty-one thousand, six hundred sixty-three".