1401431631 has 8 divisors (see below), whose sum is σ = 1868973744. Its totient is φ = 934088640.

The previous prime is 1401431623. The next prime is 1401431651. The reversal of 1401431631 is 1361341041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1401431631 - 2³ = 1401431623 is a prime.

It is a super-2 number, since 2×1401431631² = 3928021232734640322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401431651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32500 + ... + 62121.

It is an arithmetic number, because the mean of its divisors is an integer number (233621718).

Almost surely, 2^1401431631 is an apocalyptic number.

1401431631 is a deficient number, since it is larger than the sum of its proper divisors (467542113).

1401431631 is an equidigital number, since it uses as much as digits as its factorization.

1401431631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99561.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1401431631 is about 37435.6999533867. The cubic root of 1401431631 is about 1119.0701335498.

Adding to 1401431631 its reverse (1361341041), we get a palindrome (2762772672).

The spelling of 1401431631 in words is "one billion, four hundred one million, four hundred thirty-one thousand, six hundred thirty-one".