90761681 has 2 divisors, whose sum is σ = 90761682. Its totient is φ = 90761680.

The previous prime is 90761621. The next prime is 90761687. The reversal of 90761681 is 18616709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68624656 + 22137025 = 8284^2 + 4705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90761681 is a prime.

It is a super-2 number, since 2×90761681² = 16475365475891522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90761687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45380840 + 45380841.

It is an arithmetic number, because the mean of its divisors is an integer number (45380841).

Almost surely, 2^90761681 is an apocalyptic number.

It is an amenable number.

90761681 is a deficient number, since it is larger than the sum of its proper divisors (1).

90761681 is an equidigital number, since it uses as much as digits as its factorization.

90761681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 90761681 is about 9526.8925154008. The cubic root of 90761681 is about 449.4011474434.

The spelling of 90761681 in words is "ninety million, seven hundred sixty-one thousand, six hundred eighty-one".