70717531 has 4 divisors (see below), whose sum is σ = 71512200. Its totient is φ = 69922864.

The previous prime is 70717513. The next prime is 70717583. The reversal of 70717531 is 13571707.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70717531 - 2¹¹ = 70715483 is a prime.

It is a super-2 number, since 2×70717531² = 10001938381471922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70717493 and 70717502.

It is not an unprimeable number, because it can be changed into a prime (70717511) 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, 397201 + ... + 397378.

It is an arithmetic number, because the mean of its divisors is an integer number (17878050).

Almost surely, 2^70717531 is an apocalyptic number.

70717531 is a deficient number, since it is larger than the sum of its proper divisors (794669).

70717531 is an equidigital number, since it uses as much as digits as its factorization.

70717531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794668.

The product of its (nonzero) digits is 5145, while the sum is 31.

The square root of 70717531 is about 8409.3716174278. The cubic root of 70717531 is about 413.5319123996.

The spelling of 70717531 in words is "seventy million, seven hundred seventeen thousand, five hundred thirty-one".