1291162880 has 72 divisors (see below), whose sum is σ = 3534582912. Its totient is φ = 442681344.

The previous prime is 1291162877. The next prime is 1291162883. The reversal of 1291162880 is 882611921.

It is an interprime number because it is at equal distance from previous prime (1291162877) and next prime (1291162883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291162883) 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 7 ways as a sum of consecutive naturals, for example, 63092 + ... + 81011.

Almost surely, 2^1291162880 is an apocalyptic number.

1291162880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291162880 is an abundant number, since it is smaller than the sum of its proper divisors (2243420032).

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

1291162880 is an equidigital number, since it uses as much as digits as its factorization.

1291162880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144131 (or 144117 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1291162880 is about 35932.7549737005. The cubic root of 1291162880 is about 1088.9142402045.

The spelling of 1291162880 in words is "one billion, two hundred ninety-one million, one hundred sixty-two thousand, eight hundred eighty".