90121619 has 12 divisors (see below), whose sum is σ = 106433712. Its totient is φ = 74749680.

The previous prime is 90121609. The next prime is 90121627. The reversal of 90121619 is 91612109.

It is not a de Polignac number, because 90121619 - 2⁸ = 90121363 is a prime.

It is a super-2 number, since 2×90121619² = 16243812422362322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90121591 and 90121600.

It is not an unprimeable number, because it can be changed into a prime (90121609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (8869476).

Almost surely, 2^90121619 is an apocalyptic number.

90121619 is a deficient number, since it is larger than the sum of its proper divisors (16312093).

90121619 is a wasteful number, since it uses less digits than its factorization.

90121619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13466 (or 13435 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 90121619 is about 9493.2407006248. The cubic root of 90121619 is about 448.3422445250.

The spelling of 90121619 in words is "ninety million, one hundred twenty-one thousand, six hundred nineteen".