1640153631 has 4 divisors (see below), whose sum is σ = 2186871512. Its totient is φ = 1093435752.

The previous prime is 1640153623. The next prime is 1640153633. The reversal of 1640153631 is 1363510461.

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

It is not a de Polignac number, because 1640153631 - 2³ = 1640153623 is a prime.

It is a super-2 number, since 2×1640153631² = 5380207866564968322, 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 (1640153633) 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, 273358936 + ... + 273358941.

It is an arithmetic number, because the mean of its divisors is an integer number (546717878).

Almost surely, 2^1640153631 is an apocalyptic number.

1640153631 is a deficient number, since it is larger than the sum of its proper divisors (546717881).

1640153631 is an equidigital number, since it uses as much as digits as its factorization.

1640153631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546717880.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1640153631 is about 40498.8102417836. The cubic root of 1640153631 is about 1179.3105306246.

The spelling of 1640153631 in words is "one billion, six hundred forty million, one hundred fifty-three thousand, six hundred thirty-one".