90972239 has 2 divisors, whose sum is σ = 90972240. Its totient is φ = 90972238.

The previous prime is 90972227. The next prime is 90972241. The reversal of 90972239 is 93227909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90972239 is a prime.

It is a Sophie Germain prime.

Together with 90972241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90972196 and 90972205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90972269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45486119 + 45486120.

It is an arithmetic number, because the mean of its divisors is an integer number (45486120).

Almost surely, 2^90972239 is an apocalyptic number.

90972239 is a deficient number, since it is larger than the sum of its proper divisors (1).

90972239 is an equidigital number, since it uses as much as digits as its factorization.

90972239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 90972239 is about 9537.9368314117. The cubic root of 90972239 is about 449.7484009187.

The spelling of 90972239 in words is "ninety million, nine hundred seventy-two thousand, two hundred thirty-nine".