90133391 has 4 divisors (see below), whose sum is σ = 91274400. Its totient is φ = 88992384.

The previous prime is 90133387. The next prime is 90133403. The reversal of 90133391 is 19333109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19333109 = 829 ⋅23321.

It is a cyclic number.

It is not a de Polignac number, because 90133391 - 2² = 90133387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90133691) 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 3 ways as a sum of consecutive naturals, for example, 570386 + ... + 570543.

It is an arithmetic number, because the mean of its divisors is an integer number (22818600).

Almost surely, 2^90133391 is an apocalyptic number.

90133391 is a deficient number, since it is larger than the sum of its proper divisors (1141009).

90133391 is a wasteful number, since it uses less digits than its factorization.

90133391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141008.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 90133391 is about 9493.8607004738. The cubic root of 90133391 is about 448.3617650173.

The spelling of 90133391 in words is "ninety million, one hundred thirty-three thousand, three hundred ninety-one".