70931881 has 2 divisors, whose sum is σ = 70931882. Its totient is φ = 70931880.

The previous prime is 70931879. The next prime is 70931891. The reversal of 70931881 is 18813907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55651600 + 15280281 = 7460^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 70931881 - 2¹ = 70931879 is a prime.

It is a super-2 number, since 2×70931881² = 10062663484396322, which contains 22 as substring.

Together with 70931879, 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 70931881.

It is not a weakly prime, because it can be changed into another prime (70931801) 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, 35465940 + 35465941.

It is an arithmetic number, because the mean of its divisors is an integer number (35465941).

Almost surely, 2^70931881 is an apocalyptic number.

It is an amenable number.

70931881 is a deficient number, since it is larger than the sum of its proper divisors (1).

70931881 is an equidigital number, since it uses as much as digits as its factorization.

70931881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 70931881 is about 8422.1066841973. The cubic root of 70931881 is about 413.9493061066.

The spelling of 70931881 in words is "seventy million, nine hundred thirty-one thousand, eight hundred eighty-one".