1291925660 has 48 divisors (see below), whose sum is σ = 2777846400. Its totient is φ = 504483840.

The previous prime is 1291925641. The next prime is 1291925681. The reversal of 1291925660 is 665291921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420530 + ... + 423590.

It is an arithmetic number, because the mean of its divisors is an integer number (57871800).

Almost surely, 2^1291925660 is an apocalyptic number.

1291925660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291925660 is an abundant number, since it is smaller than the sum of its proper divisors (1485920740).

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

1291925660 is a wasteful number, since it uses less digits than its factorization.

1291925660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1291925660 is about 35943.3673992852. The cubic root of 1291925660 is about 1089.1286305307.

The spelling of 1291925660 in words is "one billion, two hundred ninety-one million, nine hundred twenty-five thousand, six hundred sixty".