90721419233 has 2 divisors, whose sum is σ = 90721419234. Its totient is φ = 90721419232.

The previous prime is 90721419169. The next prime is 90721419277. The reversal of 90721419233 is 33291412709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59994133969 + 30727285264 = 244937^2 + 175292^2 .

It is a cyclic number.

It is not a de Polignac number, because 90721419233 - 2⁶ = 90721419169 is a prime.

It is not a weakly prime, because it can be changed into another prime (90721415233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45360709616 + 45360709617.

It is an arithmetic number, because the mean of its divisors is an integer number (45360709617).

Almost surely, 2^90721419233 is an apocalyptic number.

It is an amenable number.

90721419233 is a deficient number, since it is larger than the sum of its proper divisors (1).

90721419233 is an equidigital number, since it uses as much as digits as its factorization.

90721419233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 90721419233 in words is "ninety billion, seven hundred twenty-one million, four hundred nineteen thousand, two hundred thirty-three".