90121269 has 16 divisors (see below), whose sum is σ = 137779200. Its totient is φ = 51328560.

The previous prime is 90121259. The next prime is 90121271. The reversal of 90121269 is 96212109.

It is a happy number.

It is not a de Polignac number, because 90121269 - 2⁸ = 90121013 is a prime.

It is a super-2 number, since 2×90121269² = 16243686252340722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90121259) 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, 369 + ... + 13430.

It is an arithmetic number, because the mean of its divisors is an integer number (8611200).

Almost surely, 2^90121269 is an apocalyptic number.

It is an amenable number.

90121269 is a deficient number, since it is larger than the sum of its proper divisors (47657931).

90121269 is a wasteful number, since it uses less digits than its factorization.

90121269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14120.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 90121269 is about 9493.2222664383. Note that the first 4 decimals coincide. The cubic root of 90121269 is about 448.3416641241.

It can be divided in two parts, 9012126 and 9, that added together give a triangular number (9012135 = T₄₂₄₅).

The spelling of 90121269 in words is "ninety million, one hundred twenty-one thousand, two hundred sixty-nine".