1291232631 has 8 divisors (see below), whose sum is σ = 1854077680. Its totient is φ = 794604672.

The previous prime is 1291232599. The next prime is 1291232653. The reversal of 1291232631 is 1362321921.

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

It is not a de Polignac number, because 1291232631 - 2⁵ = 1291232599 is a prime.

It is a super-2 number, since 2×1291232631² = 3334563414718364322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291232231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16554226 + ... + 16554303.

It is an arithmetic number, because the mean of its divisors is an integer number (231759710).

Almost surely, 2^1291232631 is an apocalyptic number.

1291232631 is a deficient number, since it is larger than the sum of its proper divisors (562845049).

1291232631 is a wasteful number, since it uses less digits than its factorization.

1291232631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33108545.

The product of its digits is 3888, while the sum is 30.

The square root of 1291232631 is about 35933.7255374391. The cubic root of 1291232631 is about 1088.9338482366.

The spelling of 1291232631 in words is "one billion, two hundred ninety-one million, two hundred thirty-two thousand, six hundred thirty-one".