2691229631 has 4 divisors (see below), whose sum is σ = 2692367064. Its totient is φ = 2690092200.

The previous prime is 2691229603. The next prime is 2691229649. The reversal of 2691229631 is 1369221962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1369221962 = 2 ⋅684610981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2691229631 is a prime.

It is a super-2 number, since 2×2691229631² = 14485433853544792322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691229661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565160 + ... + 569901.

It is an arithmetic number, because the mean of its divisors is an integer number (673091766).

Almost surely, 2^2691229631 is an apocalyptic number.

2691229631 is a deficient number, since it is larger than the sum of its proper divisors (1137433).

2691229631 is a wasteful number, since it uses less digits than its factorization.

2691229631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137432.

The product of its digits is 69984, while the sum is 41.

The square root of 2691229631 is about 51877.0626674256. The cubic root of 2691229631 is about 1390.9672943773.

The spelling of 2691229631 in words is "two billion, six hundred ninety-one million, two hundred twenty-nine thousand, six hundred thirty-one".