90745961 has 2 divisors, whose sum is σ = 90745962. Its totient is φ = 90745960.

The previous prime is 90745891. The next prime is 90745973. The reversal of 90745961 is 16954709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59598400 + 31147561 = 7720^2 + 5581^2 .

It is a cyclic number.

It is not a de Polignac number, because 90745961 - 2²² = 86551657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90745981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45372980 + 45372981.

It is an arithmetic number, because the mean of its divisors is an integer number (45372981).

Almost surely, 2^90745961 is an apocalyptic number.

It is an amenable number.

90745961 is a deficient number, since it is larger than the sum of its proper divisors (1).

90745961 is an equidigital number, since it uses as much as digits as its factorization.

90745961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 90745961 is about 9526.0674467484. The cubic root of 90745961 is about 449.3752003922.

The spelling of 90745961 in words is "ninety million, seven hundred forty-five thousand, nine hundred sixty-one".