70191731 has 2 divisors, whose sum is σ = 70191732. Its totient is φ = 70191730.

The previous prime is 70191683. The next prime is 70191733. The reversal of 70191731 is 13719107.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70191731 is a prime.

It is a super-2 number, since 2×70191731² = 9853758201552722, which contains 22 as substring.

Together with 70191733, 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 = 70191694 and 70191703.

It is not a weakly prime, because it can be changed into another prime (70191733) 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 as a sum of consecutive naturals, namely, 35095865 + 35095866.

It is an arithmetic number, because the mean of its divisors is an integer number (35095866).

Almost surely, 2^70191731 is an apocalyptic number.

70191731 is a deficient number, since it is larger than the sum of its proper divisors (1).

70191731 is an equidigital number, since it uses as much as digits as its factorization.

70191731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1323, while the sum is 29.

The square root of 70191731 is about 8378.0505489046. The cubic root of 70191731 is about 412.5044622719.

The spelling of 70191731 in words is "seventy million, one hundred ninety-one thousand, seven hundred thirty-one".