90887813 has 2 divisors, whose sum is σ = 90887814. Its totient is φ = 90887812.

The previous prime is 90887809. The next prime is 90887843. The reversal of 90887813 is 31878809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84033889 + 6853924 = 9167^2 + 2618^2 .

It is a cyclic number.

It is not a de Polignac number, because 90887813 - 2² = 90887809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90887843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45443906 + 45443907.

It is an arithmetic number, because the mean of its divisors is an integer number (45443907).

Almost surely, 2^90887813 is an apocalyptic number.

It is an amenable number.

90887813 is a deficient number, since it is larger than the sum of its proper divisors (1).

90887813 is an equidigital number, since it uses as much as digits as its factorization.

90887813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 90887813 is about 9533.5100041905. The cubic root of 90887813 is about 449.6092294856.

The spelling of 90887813 in words is "ninety million, eight hundred eighty-seven thousand, eight hundred thirteen".