70687231 has 2 divisors, whose sum is σ = 70687232. Its totient is φ = 70687230.

The previous prime is 70687229. The next prime is 70687237. The reversal of 70687231 is 13278607.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70687231 - 2¹ = 70687229 is a prime.

It is a super-2 number, since 2×70687231² = 9993369252894722, which contains 22 as substring.

Together with 70687229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70687237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35343615 + 35343616.

It is an arithmetic number, because the mean of its divisors is an integer number (35343616).

Almost surely, 2^70687231 is an apocalyptic number.

70687231 is a deficient number, since it is larger than the sum of its proper divisors (1).

70687231 is an equidigital number, since it uses as much as digits as its factorization.

70687231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 70687231 is about 8407.5698629271. The cubic root of 70687231 is about 413.4728426199.

The spelling of 70687231 in words is "seventy million, six hundred eighty-seven thousand, two hundred thirty-one".