90261688541 has 2 divisors, whose sum is σ = 90261688542. Its totient is φ = 90261688540.

The previous prime is 90261688537. The next prime is 90261688597. The reversal of 90261688541 is 14588616209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81650776516 + 8610912025 = 285746^2 + 92795^2 .

It is an emirp because it is prime and its reverse (14588616209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90261688541 - 2² = 90261688537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90261688541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90261688511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45130844270 + 45130844271.

It is an arithmetic number, because the mean of its divisors is an integer number (45130844271).

Almost surely, 2^90261688541 is an apocalyptic number.

It is an amenable number.

90261688541 is a deficient number, since it is larger than the sum of its proper divisors (1).

90261688541 is an equidigital number, since it uses as much as digits as its factorization.

90261688541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 90261688541 in words is "ninety billion, two hundred sixty-one million, six hundred eighty-eight thousand, five hundred forty-one".