90972737 has 2 divisors, whose sum is σ = 90972738. Its totient is φ = 90972736.

The previous prime is 90972719. The next prime is 90972743. The reversal of 90972737 is 73727909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67634176 + 23338561 = 8224^2 + 4831^2 .

It is an emirp because it is prime and its reverse (73727909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90972737 - 2²⁰ = 89924161 is a prime.

It is not a weakly prime, because it can be changed into another prime (90972757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45486368 + 45486369.

It is an arithmetic number, because the mean of its divisors is an integer number (45486369).

Almost surely, 2^90972737 is an apocalyptic number.

It is an amenable number.

90972737 is a deficient number, since it is larger than the sum of its proper divisors (1).

90972737 is an equidigital number, since it uses as much as digits as its factorization.

90972737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 90972737 is about 9537.9629376508. The cubic root of 90972737 is about 449.7492215877.

The spelling of 90972737 in words is "ninety million, nine hundred seventy-two thousand, seven hundred thirty-seven".