2101563531 has 12 divisors (see below), whose sum is σ = 3036785752. Its totient is φ = 1400491296.

The previous prime is 2101563517. The next prime is 2101563551. The reversal of 2101563531 is 1353651012.

2101563531 is a `hidden beast` number, since 2 + 10 + 15 + 635 + 3 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2101563531 is a prime.

It is a super-2 number, since 2×2101563531² = 8833138549658375922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101563495 and 2101563504.

It is not an unprimeable number, because it can be changed into a prime (2101563551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21061 + ... + 68166.

Almost surely, 2^2101563531 is an apocalyptic number.

2101563531 is a deficient number, since it is larger than the sum of its proper divisors (935222221).

2101563531 is a wasteful number, since it uses less digits than its factorization.

2101563531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91850 (or 91847 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 2101563531 is about 45842.8132971789. The cubic root of 2101563531 is about 1280.8968996727.

The spelling of 2101563531 in words is "two billion, one hundred one million, five hundred sixty-three thousand, five hundred thirty-one".