121554939 has 16 divisors (see below), whose sum is σ = 176993280. Its totient is φ = 73592160.

The previous prime is 121554929. The next prime is 121554949. The reversal of 121554939 is 939455121.

It is an interprime number because it is at equal distance from previous prime (121554929) and next prime (121554949).

It is not a de Polignac number, because 121554939 - 2⁵ = 121554907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121554897 and 121554906.

It is not an unprimeable number, because it can be changed into a prime (121554929) 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, 53974 + ... + 56180.

It is an arithmetic number, because the mean of its divisors is an integer number (11062080).

Almost surely, 2^121554939 is an apocalyptic number.

121554939 is a deficient number, since it is larger than the sum of its proper divisors (55438341).

121554939 is a wasteful number, since it uses less digits than its factorization.

121554939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890.

The product of its digits is 48600, while the sum is 39.

The square root of 121554939 is about 11025.1956445226. The cubic root of 121554939 is about 495.3637281761.

The spelling of 121554939 in words is "one hundred twenty-one million, five hundred fifty-four thousand, nine hundred thirty-nine".