70997081 has 4 divisors (see below), whose sum is σ = 71027664. Its totient is φ = 70966500.

The previous prime is 70997033. The next prime is 70997111. The reversal of 70997081 is 18079907.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70997081 is a prime.

It is a super-3 number, since 3×70997081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70997011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11495 + ... + 16556.

It is an arithmetic number, because the mean of its divisors is an integer number (17756916).

Almost surely, 2^70997081 is an apocalyptic number.

It is an amenable number.

70997081 is a deficient number, since it is larger than the sum of its proper divisors (30583).

70997081 is a wasteful number, since it uses less digits than its factorization.

70997081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30582.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 70997081 is about 8425.9765606130. The cubic root of 70997081 is about 414.0761001946.

The spelling of 70997081 in words is "seventy million, nine hundred ninety-seven thousand, eighty-one".