1609625631 has 4 divisors (see below), whose sum is σ = 2146167512. Its totient is φ = 1073083752.

The previous prime is 1609625623. The next prime is 1609625639. The reversal of 1609625631 is 1365269061.

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 (1609625623) and next prime (1609625639).

It is not a de Polignac number, because 1609625631 - 2³ = 1609625623 is a prime.

It is a super-2 number, since 2×1609625631² = 5181789343944296322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1609625631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609625639) 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, 268270936 + ... + 268270941.

It is an arithmetic number, because the mean of its divisors is an integer number (536541878).

Almost surely, 2^1609625631 is an apocalyptic number.

1609625631 is a deficient number, since it is larger than the sum of its proper divisors (536541881).

1609625631 is an equidigital number, since it uses as much as digits as its factorization.

1609625631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536541880.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 1609625631 is about 40120.1399673531. The cubic root of 1609625631 is about 1171.9478671476.

The spelling of 1609625631 in words is "one billion, six hundred nine million, six hundred twenty-five thousand, six hundred thirty-one".