78234131 has 2 divisors, whose sum is σ = 78234132. Its totient is φ = 78234130.

The previous prime is 78234127. The next prime is 78234137. The reversal of 78234131 is 13143287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78234131 - 2² = 78234127 is a prime.

It is a super-2 number, since 2×78234131² = 12241158506650322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78234094 and 78234103.

It is not a weakly prime, because it can be changed into another prime (78234137) 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, 39117065 + 39117066.

It is an arithmetic number, because the mean of its divisors is an integer number (39117066).

Almost surely, 2^78234131 is an apocalyptic number.

78234131 is a deficient number, since it is larger than the sum of its proper divisors (1).

78234131 is an equidigital number, since it uses as much as digits as its factorization.

78234131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 78234131 is about 8845.0059920839. The cubic root of 78234131 is about 427.6929462013.

The spelling of 78234131 in words is "seventy-eight million, two hundred thirty-four thousand, one hundred thirty-one".