121515983 has 8 divisors (see below), whose sum is σ = 130294080. Its totient is φ = 112919040.

The previous prime is 121515973. The next prime is 121515991. The reversal of 121515983 is 389515121.

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

It is a cyclic number.

It is not a de Polignac number, because 121515983 - 2²² = 117321679 is a prime.

It is a super-2 number, since 2×121515983² = 29532268248912578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121515913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43898 + ... + 46583.

It is an arithmetic number, because the mean of its divisors is an integer number (16286760).

Almost surely, 2^121515983 is an apocalyptic number.

121515983 is a deficient number, since it is larger than the sum of its proper divisors (8778097).

121515983 is an equidigital number, since it uses as much as digits as its factorization.

121515983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90577.

The product of its digits is 10800, while the sum is 35.

The square root of 121515983 is about 11023.4288222857. The cubic root of 121515983 is about 495.3108043668.

The spelling of 121515983 in words is "one hundred twenty-one million, five hundred fifteen thousand, nine hundred eighty-three".