78923161 has 2 divisors, whose sum is σ = 78923162. Its totient is φ = 78923160.

The previous prime is 78923113. The next prime is 78923167. The reversal of 78923161 is 16132987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 32137561 = 6840^2 + 5669^2 .

It is a cyclic number.

It is not a de Polignac number, because 78923161 - 2¹¹ = 78921113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78923161.

It is not a weakly prime, because it can be changed into another prime (78923167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39461580 + 39461581.

It is an arithmetic number, because the mean of its divisors is an integer number (39461581).

Almost surely, 2^78923161 is an apocalyptic number.

It is an amenable number.

78923161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78923161 is an equidigital number, since it uses as much as digits as its factorization.

78923161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 78923161 is about 8883.8708342704. The cubic root of 78923161 is about 428.9448820105.

The spelling of 78923161 in words is "seventy-eight million, nine hundred twenty-three thousand, one hundred sixty-one".