70615891 has 2 divisors, whose sum is σ = 70615892. Its totient is φ = 70615890.

The previous prime is 70615889. The next prime is 70615907. The reversal of 70615891 is 19851607.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70615891 - 2¹ = 70615889 is a prime.

Together with 70615889, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70615891.

It is not a weakly prime, because it can be changed into another prime (70615591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35307945 + 35307946.

It is an arithmetic number, because the mean of its divisors is an integer number (35307946).

Almost surely, 2^70615891 is an apocalyptic number.

70615891 is a deficient number, since it is larger than the sum of its proper divisors (1).

70615891 is an equidigital number, since it uses as much as digits as its factorization.

70615891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 70615891 is about 8403.3261866954. The cubic root of 70615891 is about 413.3336987654. Note that the first 3 decimals are identical.

The spelling of 70615891 in words is "seventy million, six hundred fifteen thousand, eight hundred ninety-one".