78345031 has 2 divisors, whose sum is σ = 78345032. Its totient is φ = 78345030.

The previous prime is 78345019. The next prime is 78345053. The reversal of 78345031 is 13054387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78345031 - 2¹⁷ = 78213959 is a prime.

It is a super-2 number, since 2×78345031² = 12275887764781922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78344984 and 78345002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78345131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39172515 + 39172516.

It is an arithmetic number, because the mean of its divisors is an integer number (39172516).

Almost surely, 2^78345031 is an apocalyptic number.

78345031 is a deficient number, since it is larger than the sum of its proper divisors (1).

78345031 is an equidigital number, since it uses as much as digits as its factorization.

78345031 is an odious number, because the sum of its binary digits is odd.

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

The square root of 78345031 is about 8851.2728463199. The cubic root of 78345031 is about 427.8949413873.

The spelling of 78345031 in words is "seventy-eight million, three hundred forty-five thousand, thirty-one".