90721419277 has 2 divisors, whose sum is σ = 90721419278. Its totient is φ = 90721419276.

The previous prime is 90721419233. The next prime is 90721419281. The reversal of 90721419277 is 77291412709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90636521481 + 84897796 = 301059^2 + 9214^2 .

It is a cyclic number.

It is not a de Polignac number, because 90721419277 - 2⁷ = 90721419149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90721419277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90721119277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45360709638 + 45360709639.

It is an arithmetic number, because the mean of its divisors is an integer number (45360709639).

Almost surely, 2^90721419277 is an apocalyptic number.

It is an amenable number.

90721419277 is a deficient number, since it is larger than the sum of its proper divisors (1).

90721419277 is an equidigital number, since it uses as much as digits as its factorization.

90721419277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 49.

The spelling of 90721419277 in words is "ninety billion, seven hundred twenty-one million, four hundred nineteen thousand, two hundred seventy-seven".