90121479 has 8 divisors (see below), whose sum is σ = 137328000. Its totient is φ = 51497976.

The previous prime is 90121469. The next prime is 90121511. The reversal of 90121479 is 97412109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90121479 - 2⁴ = 90121463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90121459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2145729 + ... + 2145770.

It is an arithmetic number, because the mean of its divisors is an integer number (17166000).

Almost surely, 2^90121479 is an apocalyptic number.

90121479 is a deficient number, since it is larger than the sum of its proper divisors (47206521).

90121479 is a wasteful number, since it uses less digits than its factorization.

90121479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291509.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 90121479 is about 9493.2333269545. The cubic root of 90121479 is about 448.3420123648.

The spelling of 90121479 in words is "ninety million, one hundred twenty-one thousand, four hundred seventy-nine".