1631800656 has 60 divisors (see below), whose sum is σ = 4678177140. Its totient is φ = 530664960.

The previous prime is 1631800649. The next prime is 1631800663. The reversal of 1631800656 is 6560081361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1631800649) and next prime (1631800663).

It can be written as a sum of positive squares in 2 ways, for example, as 34999056 + 1596801600 = 5916^2 + 39960^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1631800656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132291 + ... + 144098.

It is an arithmetic number, because the mean of its divisors is an integer number (77969619).

Almost surely, 2^1631800656 is an apocalyptic number.

1631800656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1631800656 is an abundant number, since it is smaller than the sum of its proper divisors (3046376484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631800656 is a wasteful number, since it uses less digits than its factorization.

1631800656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276444 (or 276435 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1631800656 is about 40395.5524284543. The cubic root of 1631800656 is about 1177.3051246868.

The spelling of 1631800656 in words is "one billion, six hundred thirty-one million, eight hundred thousand, six hundred fifty-six".