20100542531 has 2 divisors, whose sum is σ = 20100542532. Its totient is φ = 20100542530.

The previous prime is 20100542509. The next prime is 20100542537. The reversal of 20100542531 is 13524500102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20100542531 - 2³⁴ = 2920673347 is a prime.

It is a super-2 number, since 2×20100542531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20100542497 and 20100542506.

It is not a weakly prime, because it can be changed into another prime (20100542537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050271265 + 10050271266.

It is an arithmetic number, because the mean of its divisors is an integer number (10050271266).

Almost surely, 2^20100542531 is an apocalyptic number.

20100542531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100542531 is an equidigital number, since it uses as much as digits as its factorization.

20100542531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 20100542531 in words is "twenty billion, one hundred million, five hundred forty-two thousand, five hundred thirty-one".