70270991 has 4 divisors (see below), whose sum is σ = 80309712. Its totient is φ = 60232272.

The previous prime is 70270961. The next prime is 70270997. The reversal of 70270991 is 19907207.

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 70270991 - 2⁶ = 70270927 is a prime.

It is a super-2 number, since 2×70270991² = 9876024352244162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70270997) 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, 5019350 + ... + 5019363.

It is an arithmetic number, because the mean of its divisors is an integer number (20077428).

Almost surely, 2^70270991 is an apocalyptic number.

70270991 is a deficient number, since it is larger than the sum of its proper divisors (10038721).

70270991 is a wasteful number, since it uses less digits than its factorization.

70270991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10038720.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 70270991 is about 8382.7794316682. The cubic root of 70270991 is about 412.6596695618.

The spelling of 70270991 in words is "seventy million, two hundred seventy thousand, nine hundred ninety-one".