80961913 has 2 divisors, whose sum is σ = 80961914. Its totient is φ = 80961912.

The previous prime is 80961911. The next prime is 80961919. The reversal of 80961913 is 31916908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73736569 + 7225344 = 8587^2 + 2688^2 .

It is a cyclic number.

It is not a de Polignac number, because 80961913 - 2¹ = 80961911 is a prime.

Together with 80961911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80961911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40480956 + 40480957.

It is an arithmetic number, because the mean of its divisors is an integer number (40480957).

Almost surely, 2^80961913 is an apocalyptic number.

It is an amenable number.

80961913 is a deficient number, since it is larger than the sum of its proper divisors (1).

80961913 is an equidigital number, since it uses as much as digits as its factorization.

80961913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 80961913 is about 8997.8838067626. The cubic root of 80961913 is about 432.6070444610.

The spelling of 80961913 in words is "eighty million, nine hundred sixty-one thousand, nine hundred thirteen".