161078135731 has 2 divisors, whose sum is σ = 161078135732. Its totient is φ = 161078135730.

The previous prime is 161078135707. The next prime is 161078135737. The reversal of 161078135731 is 137531870161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161078135731 - 2³³ = 152488201139 is a prime.

It is a super-2 number, since 2×161078135731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161078135737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80539067865 + 80539067866.

It is an arithmetic number, because the mean of its divisors is an integer number (80539067866).

Almost surely, 2^161078135731 is an apocalyptic number.

161078135731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161078135731 is an equidigital number, since it uses as much as digits as its factorization.

161078135731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 161078135731 in words is "one hundred sixty-one billion, seventy-eight million, one hundred thirty-five thousand, seven hundred thirty-one".