90953981 has 2 divisors, whose sum is σ = 90953982. Its totient is φ = 90953980.

The previous prime is 90953963. The next prime is 90954001. The reversal of 90953981 is 18935909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90421081 + 532900 = 9509^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 90953981 - 2²⁶ = 23845117 is a prime.

It is a super-2 number, since 2×90953981² = 16545253319496722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90953081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45476990 + 45476991.

It is an arithmetic number, because the mean of its divisors is an integer number (45476991).

Almost surely, 2^90953981 is an apocalyptic number.

It is an amenable number.

90953981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90953981 is an equidigital number, since it uses as much as digits as its factorization.

90953981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 90953981 is about 9536.9796581517. The cubic root of 90953981 is about 449.7183109491.

The spelling of 90953981 in words is "ninety million, nine hundred fifty-three thousand, nine hundred eighty-one".