78342031 has 2 divisors, whose sum is σ = 78342032. Its totient is φ = 78342030.

The previous prime is 78341951. The next prime is 78342059. The reversal of 78342031 is 13024387.

It is an a-pointer prime, because the next prime (78342059) can be obtained adding 78342031 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78342031 - 2¹⁵ = 78309263 is a prime.

It is a super-2 number, since 2×78342031² = 12274947642409922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78342331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39171015 + 39171016.

It is an arithmetic number, because the mean of its divisors is an integer number (39171016).

Almost surely, 2^78342031 is an apocalyptic number.

78342031 is a deficient number, since it is larger than the sum of its proper divisors (1).

78342031 is an equidigital number, since it uses as much as digits as its factorization.

78342031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 78342031 is about 8851.1033775456. The cubic root of 78342031 is about 427.8894796445.

The spelling of 78342031 in words is "seventy-eight million, three hundred forty-two thousand, thirty-one".