90181975 has 12 divisors (see below), whose sum is σ = 120428056. Its totient is φ = 66595680.

The previous prime is 90181939. The next prime is 90181979. The reversal of 90181975 is 57918109.

It is a happy number.

It is not a de Polignac number, because 90181975 - 2¹¹ = 90179927 is a prime.

It is a super-2 number, since 2×90181975² = 16265577229801250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90181979) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 138417 + ... + 139066.

Almost surely, 2^90181975 is an apocalyptic number.

90181975 is a deficient number, since it is larger than the sum of its proper divisors (30246081).

90181975 is a wasteful number, since it uses less digits than its factorization.

90181975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277506 (or 277501 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 90181975 is about 9496.4190619412. The cubic root of 90181975 is about 448.4423096968.

The spelling of 90181975 in words is "ninety million, one hundred eighty-one thousand, nine hundred seventy-five".