121575407 has 4 divisors (see below), whose sum is σ = 121600416. Its totient is φ = 121550400.

The previous prime is 121575403. The next prime is 121575409. The reversal of 121575407 is 704575121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704575121 = 1877 ⋅375373.

It is a cyclic number.

It is not a de Polignac number, because 121575407 - 2² = 121575403 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 (121575403) 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, 2594 + ... + 15807.

It is an arithmetic number, because the mean of its divisors is an integer number (30400104).

Almost surely, 2^121575407 is an apocalyptic number.

121575407 is a deficient number, since it is larger than the sum of its proper divisors (25009).

121575407 is an equidigital number, since it uses as much as digits as its factorization.

121575407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25008.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 121575407 is about 11026.1238429468. The cubic root of 121575407 is about 495.3915305176.

The spelling of 121575407 in words is "one hundred twenty-one million, five hundred seventy-five thousand, four hundred seven".