121574639 has 4 divisors (see below), whose sum is σ = 121616040. Its totient is φ = 121533240.

The previous prime is 121574581. The next prime is 121574669. The reversal of 121574639 is 936475121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936475121 = 997 ⋅939293.

It is a cyclic number.

It is not a de Polignac number, because 121574639 - 2¹² = 121570543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121574669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15929 + ... + 22290.

It is an arithmetic number, because the mean of its divisors is an integer number (30404010).

Almost surely, 2^121574639 is an apocalyptic number.

121574639 is a deficient number, since it is larger than the sum of its proper divisors (41401).

121574639 is an equidigital number, since it uses as much as digits as its factorization.

121574639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41400.

The product of its digits is 45360, while the sum is 38.

The square root of 121574639 is about 11026.0890165099. The cubic root of 121574639 is about 495.3904873749.

The spelling of 121574639 in words is "one hundred twenty-one million, five hundred seventy-four thousand, six hundred thirty-nine".