90812549 has 2 divisors, whose sum is σ = 90812550. Its totient is φ = 90812548.

The previous prime is 90812531. The next prime is 90812567. The reversal of 90812549 is 94521809.

It is a balanced prime because it is at equal distance from previous prime (90812531) and next prime (90812567).

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 6723649 = 9170^2 + 2593^2 .

It is a cyclic number.

It is not a de Polignac number, because 90812549 - 2¹² = 90808453 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90812509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45406274 + 45406275.

It is an arithmetic number, because the mean of its divisors is an integer number (45406275).

Almost surely, 2^90812549 is an apocalyptic number.

It is an amenable number.

90812549 is a deficient number, since it is larger than the sum of its proper divisors (1).

90812549 is an equidigital number, since it uses as much as digits as its factorization.

90812549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 90812549 is about 9529.5618472205. The cubic root of 90812549 is about 449.4850884044.

The spelling of 90812549 in words is "ninety million, eight hundred twelve thousand, five hundred forty-nine".