70591931 has 2 divisors, whose sum is σ = 70591932. Its totient is φ = 70591930.

The previous prime is 70591921. The next prime is 70591933. The reversal of 70591931 is 13919507.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70591931 - 2²² = 66397627 is a prime.

It is a super-2 number, since 2×70591931² = 9966441444617522, which contains 22 as substring.

Together with 70591933, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 70591891 and 70591900.

It is not a weakly prime, because it can be changed into another prime (70591933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35295965 + 35295966.

It is an arithmetic number, because the mean of its divisors is an integer number (35295966).

Almost surely, 2^70591931 is an apocalyptic number.

70591931 is a deficient number, since it is larger than the sum of its proper divisors (1).

70591931 is an equidigital number, since it uses as much as digits as its factorization.

70591931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 70591931 is about 8401.9004397815. The cubic root of 70591931 is about 413.2869453809.

The spelling of 70591931 in words is "seventy million, five hundred ninety-one thousand, nine hundred thirty-one".