90100577621 has 2 divisors, whose sum is σ = 90100577622. Its totient is φ = 90100577620.

The previous prime is 90100577599. The next prime is 90100577641. The reversal of 90100577621 is 12677500109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86178060721 + 3922516900 = 293561^2 + 62630^2 .

It is a cyclic number.

It is not a de Polignac number, because 90100577621 - 2³⁰ = 89026835797 is a prime.

It is a super-2 number, since 2×90100577621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90100577641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45050288810 + 45050288811.

It is an arithmetic number, because the mean of its divisors is an integer number (45050288811).

Almost surely, 2^90100577621 is an apocalyptic number.

It is an amenable number.

90100577621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90100577621 is an equidigital number, since it uses as much as digits as its factorization.

90100577621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 90100577621 in words is "ninety billion, one hundred million, five hundred seventy-seven thousand, six hundred twenty-one".