1640915131 has 8 divisors (see below), whose sum is σ = 1679641920. Its totient is φ = 1602214152.

The previous prime is 1640915119. The next prime is 1640915137. The reversal of 1640915131 is 1315190461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640915131 - 2⁵ = 1640915099 is a prime.

It is a super-2 number, since 2×1640915131² = 5385204934289494322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640915093 and 1640915102.

It is not an unprimeable number, because it can be changed into a prime (1640915137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195540 + ... + 203758.

It is an arithmetic number, because the mean of its divisors is an integer number (209955240).

Almost surely, 2^1640915131 is an apocalyptic number.

1640915131 is a deficient number, since it is larger than the sum of its proper divisors (38726789).

1640915131 is an equidigital number, since it uses as much as digits as its factorization.

1640915131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1640915131 is about 40508.2106615437. The cubic root of 1640915131 is about 1179.4930147539.

The spelling of 1640915131 in words is "one billion, six hundred forty million, nine hundred fifteen thousand, one hundred thirty-one".