90365861 has 2 divisors, whose sum is σ = 90365862. Its totient is φ = 90365860.

The previous prime is 90365857. The next prime is 90365909. The reversal of 90365861 is 16856309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84456100 + 5909761 = 9190^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 90365861 - 2² = 90365857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90365831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45182930 + 45182931.

It is an arithmetic number, because the mean of its divisors is an integer number (45182931).

Almost surely, 2^90365861 is an apocalyptic number.

It is an amenable number.

90365861 is a deficient number, since it is larger than the sum of its proper divisors (1).

90365861 is an equidigital number, since it uses as much as digits as its factorization.

90365861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 90365861 is about 9506.0959915204. The cubic root of 90365861 is about 448.7469022632.

The spelling of 90365861 in words is "ninety million, three hundred sixty-five thousand, eight hundred sixty-one".