121791501 has 24 divisors (see below), whose sum is σ = 199428320. Its totient is φ = 71002656.

The previous prime is 121791497. The next prime is 121791541. The reversal of 121791501 is 105197121.

It is not a de Polignac number, because 121791501 - 2² = 121791497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121791541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25171 + ... + 29616.

Almost surely, 2^121791501 is an apocalyptic number.

It is an amenable number.

121791501 is a deficient number, since it is larger than the sum of its proper divisors (77636819).

121791501 is a wasteful number, since it uses less digits than its factorization.

121791501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54825 (or 54822 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 27.

The square root of 121791501 is about 11035.9186749450. The cubic root of 121791501 is about 495.6848677328.

The spelling of 121791501 in words is "one hundred twenty-one million, seven hundred ninety-one thousand, five hundred one".