90726521 has 2 divisors, whose sum is σ = 90726522. Its totient is φ = 90726520.

The previous prime is 90726473. The next prime is 90726533. The reversal of 90726521 is 12562709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58690921 + 32035600 = 7661^2 + 5660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90726521 is a prime.

It is a super-2 number, since 2×90726521² = 16462603225526882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90726541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45363260 + 45363261.

It is an arithmetic number, because the mean of its divisors is an integer number (45363261).

Almost surely, 2^90726521 is an apocalyptic number.

It is an amenable number.

90726521 is a deficient number, since it is larger than the sum of its proper divisors (1).

90726521 is an equidigital number, since it uses as much as digits as its factorization.

90726521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 90726521 is about 9525.0470340046. The cubic root of 90726521 is about 449.3431090547.

The spelling of 90726521 in words is "ninety million, seven hundred twenty-six thousand, five hundred twenty-one".