90189255038381 has 2 divisors, whose sum is σ = 90189255038382. Its totient is φ = 90189255038380.

The previous prime is 90189255038357. The next prime is 90189255038429. The reversal of 90189255038381 is 18383055298109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49089500832100 + 41099754206281 = 7006390^2 + 6410909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90189255038381 is a prime.

It is a super-2 number, since 2×90189255038381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90189252038381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45094627519190 + 45094627519191.

It is an arithmetic number, because the mean of its divisors is an integer number (45094627519191).

Almost surely, 2^{90189255038381} is an apocalyptic number.

It is an amenable number.

90189255038381 is a deficient number, since it is larger than the sum of its proper divisors (1).

90189255038381 is an equidigital number, since it uses as much as digits as its factorization.

90189255038381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 62.

The spelling of 90189255038381 in words is "ninety trillion, one hundred eighty-nine billion, two hundred fifty-five million, thirty-eight thousand, three hundred eighty-one".