78157361 has 2 divisors, whose sum is σ = 78157362. Its totient is φ = 78157360.

The previous prime is 78157333. The next prime is 78157367. The reversal of 78157361 is 16375187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 7075600 = 8431^2 + 2660^2 .

It is an emirp because it is prime and its reverse (16375187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78157361 is a prime.

It is a super-2 number, since 2×78157361² = 12217146156968642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78157367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39078680 + 39078681.

It is an arithmetic number, because the mean of its divisors is an integer number (39078681).

Almost surely, 2^78157361 is an apocalyptic number.

It is an amenable number.

78157361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78157361 is an equidigital number, since it uses as much as digits as its factorization.

78157361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 78157361 is about 8840.6651899051. The cubic root of 78157361 is about 427.5530041549.

The spelling of 78157361 in words is "seventy-eight million, one hundred fifty-seven thousand, three hundred sixty-one".