78851131 has 2 divisors, whose sum is σ = 78851132. Its totient is φ = 78851130.

The previous prime is 78851099. The next prime is 78851137. The reversal of 78851131 is 13115887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78851131 - 2⁵ = 78851099 is a prime.

It is a super-2 number, since 2×78851131² = 12435001719958322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78851137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39425565 + 39425566.

It is an arithmetic number, because the mean of its divisors is an integer number (39425566).

Almost surely, 2^78851131 is an apocalyptic number.

78851131 is a deficient number, since it is larger than the sum of its proper divisors (1).

78851131 is an equidigital number, since it uses as much as digits as its factorization.

78851131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 78851131 is about 8879.8159327770. The cubic root of 78851131 is about 428.8143487015.

The spelling of 78851131 in words is "seventy-eight million, eight hundred fifty-one thousand, one hundred thirty-one".