1291937164 has 48 divisors (see below), whose sum is σ = 2622122496. Its totient is φ = 545529600.

The previous prime is 1291937159. The next prime is 1291937173. The reversal of 1291937164 is 4617391921.

It is a self number, because there is not a number n which added to its sum of digits gives 1291937164.

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, 1466004 + ... + 1466884.

It is an arithmetic number, because the mean of its divisors is an integer number (54627552).

Almost surely, 2^1291937164 is an apocalyptic number.

1291937164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1291937164 is an abundant number, since it is smaller than the sum of its proper divisors (1330185332).

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

1291937164 is a wasteful number, since it uses less digits than its factorization.

1291937164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1604 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 1291937164 is about 35943.5274284537. The cubic root of 1291937164 is about 1089.1318632499.

The spelling of 1291937164 in words is "one billion, two hundred ninety-one million, nine hundred thirty-seven thousand, one hundred sixty-four".