70731313 has 4 divisors (see below), whose sum is σ = 71126640. Its totient is φ = 70335988.

The previous prime is 70731301. The next prime is 70731329. The reversal of 70731313 is 31313707.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31313707 = 29 ⋅1079783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70731313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70731113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197395 + ... + 197752.

It is an arithmetic number, because the mean of its divisors is an integer number (17781660).

Almost surely, 2^70731313 is an apocalyptic number.

It is an amenable number.

70731313 is a deficient number, since it is larger than the sum of its proper divisors (395327).

70731313 is a wasteful number, since it uses less digits than its factorization.

70731313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395326.

The product of its (nonzero) digits is 1323, while the sum is 25.

The square root of 70731313 is about 8410.1910204228. The cubic root of 70731313 is about 413.5587747939.

The spelling of 70731313 in words is "seventy million, seven hundred thirty-one thousand, three hundred thirteen".