70031231 has 2 divisors, whose sum is σ = 70031232. Its totient is φ = 70031230.

The previous prime is 70031161. The next prime is 70031243. The reversal of 70031231 is 13213007.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70031231 is a prime.

It is a super-2 number, since 2×70031231² = 9808746630750722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70031261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35015615 + 35015616.

It is an arithmetic number, because the mean of its divisors is an integer number (35015616).

Almost surely, 2^70031231 is an apocalyptic number.

70031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

70031231 is an equidigital number, since it uses as much as digits as its factorization.

70031231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 70031231 is about 8368.4664664441. The cubic root of 70031231 is about 412.1898122304.

Adding to 70031231 its reverse (13213007), we get a palindrome (83244238).

It can be divided in two parts, 70031 and 231, that multiplied together give a palindrome (16177161).

The spelling of 70031231 in words is "seventy million, thirty-one thousand, two hundred thirty-one".