78958031 has 2 divisors, whose sum is σ = 78958032. Its totient is φ = 78958030.

The previous prime is 78957943. The next prime is 78958067. The reversal of 78958031 is 13085987.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13085987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78958031 - 2¹⁴ = 78941647 is a prime.

It is a super-2 number, since 2×78958031² = 12468741318793922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78958031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78958531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39479015 + 39479016.

It is an arithmetic number, because the mean of its divisors is an integer number (39479016).

Almost surely, 2^78958031 is an apocalyptic number.

78958031 is a deficient number, since it is larger than the sum of its proper divisors (1).

78958031 is an equidigital number, since it uses as much as digits as its factorization.

78958031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 78958031 is about 8885.8331629623. The cubic root of 78958031 is about 429.0080451579.

The spelling of 78958031 in words is "seventy-eight million, nine hundred fifty-eight thousand, thirty-one".