61138175531 has 2 divisors, whose sum is σ = 61138175532. Its totient is φ = 61138175530.

The previous prime is 61138175507. The next prime is 61138175543. The reversal of 61138175531 is 13557183116.

61138175531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61138175531 is a prime.

It is a super-2 number, since 2×61138175531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61138165531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569087765 + 30569087766.

It is an arithmetic number, because the mean of its divisors is an integer number (30569087766).

Almost surely, 2^61138175531 is an apocalyptic number.

61138175531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138175531 is an equidigital number, since it uses as much as digits as its factorization.

61138175531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The spelling of 61138175531 in words is "sixty-one billion, one hundred thirty-eight million, one hundred seventy-five thousand, five hundred thirty-one".