78161137 has 4 divisors (see below), whose sum is σ = 80682496. Its totient is φ = 75639780.

The previous prime is 78161123. The next prime is 78161147. The reversal of 78161137 is 73116187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78161137 - 2⁷ = 78161009 is a prime.

It is a super-2 number, since 2×78161137² = 12218326674265538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78161147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260633 + ... + 1260694.

It is an arithmetic number, because the mean of its divisors is an integer number (20170624).

Almost surely, 2^78161137 is an apocalyptic number.

It is an amenable number.

78161137 is a deficient number, since it is larger than the sum of its proper divisors (2521359).

78161137 is a wasteful number, since it uses less digits than its factorization.

78161137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521358.

The product of its digits is 7056, while the sum is 34.

The square root of 78161137 is about 8840.8787459166. The cubic root of 78161137 is about 427.5598894699.

The spelling of 78161137 in words is "seventy-eight million, one hundred sixty-one thousand, one hundred thirty-seven".