20113151531 has 4 divisors (see below), whose sum is σ = 21941619864. Its totient is φ = 18284683200.

The previous prime is 20113151519. The next prime is 20113151599. The reversal of 20113151531 is 13515131102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20113151531 - 2³⁴ = 2933282347 is a prime.

It is a super-2 number, since 2×20113151531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20113151497 and 20113151506.

It is not an unprimeable number, because it can be changed into a prime (20113151431) 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, 914234150 + ... + 914234171.

It is an arithmetic number, because the mean of its divisors is an integer number (5485404966).

Almost surely, 2^20113151531 is an apocalyptic number.

20113151531 is a deficient number, since it is larger than the sum of its proper divisors (1828468333).

20113151531 is a wasteful number, since it uses less digits than its factorization.

20113151531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828468332.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 20113151531 its reverse (13515131102), we get a palindrome (33628282633).

The spelling of 20113151531 in words is "twenty billion, one hundred thirteen million, one hundred fifty-one thousand, five hundred thirty-one".