90893813 has 2 divisors, whose sum is σ = 90893814. Its totient is φ = 90893812.

The previous prime is 90893809. The next prime is 90893819. The reversal of 90893813 is 31839809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51868804 + 39025009 = 7202^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 90893813 - 2² = 90893809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90893819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45446906 + 45446907.

It is an arithmetic number, because the mean of its divisors is an integer number (45446907).

Almost surely, 2^90893813 is an apocalyptic number.

It is an amenable number.

90893813 is a deficient number, since it is larger than the sum of its proper divisors (1).

90893813 is an equidigital number, since it uses as much as digits as its factorization.

90893813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 90893813 is about 9533.8246784803. The cubic root of 90893813 is about 449.6191229867.

The spelling of 90893813 in words is "ninety million, eight hundred ninety-three thousand, eight hundred thirteen".