90226434581 has 2 divisors, whose sum is σ = 90226434582. Its totient is φ = 90226434580.

The previous prime is 90226434569. The next prime is 90226434589. The reversal of 90226434581 is 18543462209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82423539025 + 7802895556 = 287095^2 + 88334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90226434581 is a prime.

It is a super-2 number, since 2×90226434581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90226434589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45113217290 + 45113217291.

It is an arithmetic number, because the mean of its divisors is an integer number (45113217291).

Almost surely, 2^90226434581 is an apocalyptic number.

It is an amenable number.

90226434581 is a deficient number, since it is larger than the sum of its proper divisors (1).

90226434581 is an equidigital number, since it uses as much as digits as its factorization.

90226434581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 90226434581 in words is "ninety billion, two hundred twenty-six million, four hundred thirty-four thousand, five hundred eighty-one".