90757897 has 2 divisors, whose sum is σ = 90757898. Its totient is φ = 90757896.

The previous prime is 90757879. The next prime is 90757903. The reversal of 90757897 is 79875709.

Together with previous prime (90757879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77369616 + 13388281 = 8796^2 + 3659^2 .

It is an emirp because it is prime and its reverse (79875709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90757897 - 2¹¹ = 90755849 is a prime.

It is a super-3 number, since 3×90757897³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (90757847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45378948 + 45378949.

It is an arithmetic number, because the mean of its divisors is an integer number (45378949).

Almost surely, 2^90757897 is an apocalyptic number.

It is an amenable number.

90757897 is a deficient number, since it is larger than the sum of its proper divisors (1).

90757897 is an equidigital number, since it uses as much as digits as its factorization.

90757897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 90757897 is about 9526.6939176191. The cubic root of 90757897 is about 449.3949019384.

The spelling of 90757897 in words is "ninety million, seven hundred fifty-seven thousand, eight hundred ninety-seven".