78161147 has 2 divisors, whose sum is σ = 78161148. Its totient is φ = 78161146.

The previous prime is 78161123. The next prime is 78161159. The reversal of 78161147 is 74116187.

It is a strong prime.

It is an emirp because it is prime and its reverse (74116187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78161147 - 2⁸ = 78160891 is a prime.

It is a super-2 number, since 2×78161147² = 12218329800711218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78161197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39080573 + 39080574.

It is an arithmetic number, because the mean of its divisors is an integer number (39080574).

Almost surely, 2^78161147 is an apocalyptic number.

78161147 is a deficient number, since it is larger than the sum of its proper divisors (1).

78161147 is an equidigital number, since it uses as much as digits as its factorization.

78161147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 35.

The square root of 78161147 is about 8840.8793114712. The cubic root of 78161147 is about 427.5599077040.

The spelling of 78161147 in words is "seventy-eight million, one hundred sixty-one thousand, one hundred forty-seven".