90171550 has 48 divisors (see below), whose sum is σ = 195335712. Its totient is φ = 30326400.

The previous prime is 90171547. The next prime is 90171551. The reversal of 90171550 is 5517109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90171551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16120 + ... + 20980.

It is an arithmetic number, because the mean of its divisors is an integer number (4069494).

Almost surely, 2^90171550 is an apocalyptic number.

90171550 is an abundant number, since it is smaller than the sum of its proper divisors (105164162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90171550 is a wasteful number, since it uses less digits than its factorization.

90171550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4933 (or 4928 counting only the distinct ones).

The product of its (nonzero) digits is 1575, while the sum is 28.

The square root of 90171550 is about 9495.8701549674. The cubic root of 90171550 is about 448.4250291141.

Adding to 90171550 its reverse (5517109), we get a palindrome (95688659).

The spelling of 90171550 in words is "ninety million, one hundred seventy-one thousand, five hundred fifty".