90391138 has 4 divisors (see below), whose sum is σ = 135586710. Its totient is φ = 45195568.

The previous prime is 90391123. The next prime is 90391153. The reversal of 90391138 is 83119309.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (90391123) and next prime (90391153).

It can be written as a sum of positive squares in only one way, i.e., 71961289 + 18429849 = 8483^2 + 4293^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22597783 + ... + 22597786.

Almost surely, 2^90391138 is an apocalyptic number.

90391138 is a deficient number, since it is larger than the sum of its proper divisors (45195572).

90391138 is a wasteful number, since it uses less digits than its factorization.

90391138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45195571.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 90391138 is about 9507.4254138542. The cubic root of 90391138 is about 448.7887392942.

The spelling of 90391138 in words is "ninety million, three hundred ninety-one thousand, one hundred thirty-eight".