90663731 has 2 divisors, whose sum is σ = 90663732. Its totient is φ = 90663730.

The previous prime is 90663701. The next prime is 90663733. The reversal of 90663731 is 13736609.

It is a strong prime.

It is an emirp because it is prime and its reverse (13736609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90663731 - 2⁶ = 90663667 is a prime.

It is a super-2 number, since 2×90663731² = 16439824237680722, which contains 22 as substring.

Together with 90663733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90663691 and 90663700.

It is not a weakly prime, because it can be changed into another prime (90663733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45331865 + 45331866.

It is an arithmetic number, because the mean of its divisors is an integer number (45331866).

Almost surely, 2^90663731 is an apocalyptic number.

90663731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90663731 is an equidigital number, since it uses as much as digits as its factorization.

90663731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 90663731 is about 9521.7504168089. The cubic root of 90663731 is about 449.2394246897.

The spelling of 90663731 in words is "ninety million, six hundred sixty-three thousand, seven hundred thirty-one".