90921501 has 16 divisors (see below), whose sum is σ = 146944320. Its totient is φ = 55103760.

The previous prime is 90921463. The next prime is 90921503. The reversal of 90921501 is 10512909.

It is a happy number.

It is not a de Polignac number, because 90921501 - 2⁷ = 90921373 is a prime.

It is a super-3 number, since 3×90921501³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90921503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152770 + ... + 153363.

It is an arithmetic number, because the mean of its divisors is an integer number (9184020).

Almost surely, 2^90921501 is an apocalyptic number.

It is an amenable number.

90921501 is a deficient number, since it is larger than the sum of its proper divisors (56022819).

90921501 is a wasteful number, since it uses less digits than its factorization.

90921501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306153 (or 306147 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 90921501 is about 9535.2766609050. The cubic root of 90921501 is about 449.6647725566.

The spelling of 90921501 in words is "ninety million, nine hundred twenty-one thousand, five hundred one".