1640612125 has 8 divisors (see below), whose sum is σ = 2047484088. Its totient is φ = 1312489600.

The previous prime is 1640612117. The next prime is 1640612173. The reversal of 1640612125 is 5212160461.

It can be written as a sum of positive squares in 4 ways, for example, as 1819801 + 1638792324 = 1349^2 + 40482^2 .

It is not a de Polignac number, because 1640612125 - 2³ = 1640612117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640612093 and 1640612102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6562324 + ... + 6562573.

It is an arithmetic number, because the mean of its divisors is an integer number (255935511).

Almost surely, 2^1640612125 is an apocalyptic number.

It is an amenable number.

1640612125 is a deficient number, since it is larger than the sum of its proper divisors (406871963).

1640612125 is an equidigital number, since it uses as much as digits as its factorization.

1640612125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13124912 (or 13124902 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1640612125 is about 40504.4704322869. The cubic root of 1640612125 is about 1179.4204098490.

Adding to 1640612125 its reverse (5212160461), we get a palindrome (6852772586).

The spelling of 1640612125 in words is "one billion, six hundred forty million, six hundred twelve thousand, one hundred twenty-five".