61133256731 has 2 divisors, whose sum is σ = 61133256732. Its totient is φ = 61133256730.

The previous prime is 61133256707. The next prime is 61133256733. The reversal of 61133256731 is 13765233116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61133256731 - 2²⁶ = 61066147867 is a prime.

It is a super-2 number, since 2×61133256731² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 61133256733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61133256733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30566628365 + 30566628366.

It is an arithmetic number, because the mean of its divisors is an integer number (30566628366).

Almost surely, 2^61133256731 is an apocalyptic number.

61133256731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61133256731 is an equidigital number, since it uses as much as digits as its factorization.

61133256731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

Adding to 61133256731 its reverse (13765233116), we get a palindrome (74898489847).

The spelling of 61133256731 in words is "sixty-one billion, one hundred thirty-three million, two hundred fifty-six thousand, seven hundred thirty-one".