90138077 has 2 divisors, whose sum is σ = 90138078. Its totient is φ = 90138076.

The previous prime is 90138011. The next prime is 90138101. The reversal of 90138077 is 77083109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47183161 + 42954916 = 6869^2 + 6554^2 .

It is a cyclic number.

It is not a de Polignac number, because 90138077 - 2⁸ = 90137821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90138677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45069038 + 45069039.

It is an arithmetic number, because the mean of its divisors is an integer number (45069039).

Almost surely, 2^90138077 is an apocalyptic number.

It is an amenable number.

90138077 is a deficient number, since it is larger than the sum of its proper divisors (1).

90138077 is an equidigital number, since it uses as much as digits as its factorization.

90138077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 90138077 is about 9494.1074883319. The cubic root of 90138077 is about 448.3695349340.

The spelling of 90138077 in words is "ninety million, one hundred thirty-eight thousand, seventy-seven".