1631886945 has 32 divisors (see below), whose sum is σ = 2857983744. Its totient is φ = 790214400.

The previous prime is 1631886931. The next prime is 1631886947. The reversal of 1631886945 is 5496881361.

It is not a de Polignac number, because 1631886945 - 2⁵ = 1631886913 is a prime.

It is a super-2 number, since 2×1631886945² = 5326110002522866050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1631886947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56701 + ... + 80490.

It is an arithmetic number, because the mean of its divisors is an integer number (89311992).

Almost surely, 2^1631886945 is an apocalyptic number.

1631886945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1631886945 is a deficient number, since it is larger than the sum of its proper divisors (1226096799).

1631886945 is a wasteful number, since it uses less digits than its factorization.

1631886945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137273.

The product of its digits is 1244160, while the sum is 51.

The square root of 1631886945 is about 40396.6204650835. The cubic root of 1631886945 is about 1177.3258761372.

The spelling of 1631886945 in words is "one billion, six hundred thirty-one million, eight hundred eighty-six thousand, nine hundred forty-five".