16121634631 has 4 divisors (see below), whose sum is σ = 16122744792. Its totient is φ = 16120524472.

The previous prime is 16121634623. The next prime is 16121634677. The reversal of 16121634631 is 13643612161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13643612161 = 73039 ⋅186799.

It is a cyclic number.

It is not a de Polignac number, because 16121634631 - 2³ = 16121634623 is a prime.

It is a super-2 number, since 2×16121634631² (a number of 21 digits) 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 (16121634601) 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 3 ways as a sum of consecutive naturals, for example, 533005 + ... + 562438.

It is an arithmetic number, because the mean of its divisors is an integer number (4030686198).

Almost surely, 2^16121634631 is an apocalyptic number.

16121634631 is a deficient number, since it is larger than the sum of its proper divisors (1110161).

16121634631 is a wasteful number, since it uses less digits than its factorization.

16121634631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110160.

The product of its digits is 15552, while the sum is 34.

The spelling of 16121634631 in words is "sixteen billion, one hundred twenty-one million, six hundred thirty-four thousand, six hundred thirty-one".