90131049 has 10 divisors (see below), whose sum is σ = 134640330. Its totient is φ = 60087312.

The previous prime is 90131047. The next prime is 90131057. The reversal of 90131049 is 94013109.

It can be written as a sum of positive squares in only one way, i.e., 73874025 + 16257024 = 8595^2 + 4032^2 .

It is not a de Polignac number, because 90131049 - 2¹ = 90131047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90131047) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 556284 + ... + 556445.

It is an arithmetic number, because the mean of its divisors is an integer number (13464033).

Almost surely, 2^90131049 is an apocalyptic number.

It is an amenable number.

90131049 is a deficient number, since it is larger than the sum of its proper divisors (44509281).

90131049 is a wasteful number, since it uses less digits than its factorization.

90131049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112741 (or 1112732 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 90131049 is about 9493.7373568053. The cubic root of 90131049 is about 448.3578816161.

The spelling of 90131049 in words is "ninety million, one hundred thirty-one thousand, forty-nine".