78131707 has 2 divisors, whose sum is σ = 78131708. Its totient is φ = 78131706.

The previous prime is 78131693. The next prime is 78131717. The reversal of 78131707 is 70713187.

It is a strong prime.

It is an emirp because it is prime and its reverse (70713187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78131707 - 2¹¹ = 78129659 is a prime.

It is a super-2 number, since 2×78131707² = 12209127277467698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78131717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39065853 + 39065854.

It is an arithmetic number, because the mean of its divisors is an integer number (39065854).

Almost surely, 2^78131707 is an apocalyptic number.

78131707 is a deficient number, since it is larger than the sum of its proper divisors (1).

78131707 is an equidigital number, since it uses as much as digits as its factorization.

78131707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 78131707 is about 8839.2141619038. The cubic root of 78131707 is about 427.5062197150.

The spelling of 78131707 in words is "seventy-eight million, one hundred thirty-one thousand, seven hundred seven".