78252331 has 2 divisors, whose sum is σ = 78252332. Its totient is φ = 78252330.

The previous prime is 78252329. The next prime is 78252337. The reversal of 78252331 is 13325287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78252331 - 2¹ = 78252329 is a prime.

It is a super-2 number, since 2×78252331² = 12246854613867122, which contains 22 as substring.

Together with 78252329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78252293 and 78252302.

It is not a weakly prime, because it can be changed into another prime (78252337) 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, 39126165 + 39126166.

It is an arithmetic number, because the mean of its divisors is an integer number (39126166).

Almost surely, 2^78252331 is an apocalyptic number.

78252331 is a deficient number, since it is larger than the sum of its proper divisors (1).

78252331 is an equidigital number, since it uses as much as digits as its factorization.

78252331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 78252331 is about 8846.0347614058. The cubic root of 78252331 is about 427.7261090847.

The spelling of 78252331 in words is "seventy-eight million, two hundred fifty-two thousand, three hundred thirty-one".