90172726243 has 2 divisors, whose sum is σ = 90172726244. Its totient is φ = 90172726242.

The previous prime is 90172726181. The next prime is 90172726261. The reversal of 90172726243 is 34262727109.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90172726243 is a prime.

It is a super-2 number, since 2×90172726243² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90172726243.

It is not a weakly prime, because it can be changed into another prime (90172726543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45086363121 + 45086363122.

It is an arithmetic number, because the mean of its divisors is an integer number (45086363122).

Almost surely, 2^90172726243 is an apocalyptic number.

90172726243 is a deficient number, since it is larger than the sum of its proper divisors (1).

90172726243 is an equidigital number, since it uses as much as digits as its factorization.

90172726243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 90172726243 in words is "ninety billion, one hundred seventy-two million, seven hundred twenty-six thousand, two hundred forty-three".