121393591 has 4 divisors (see below), whose sum is σ = 132429384. Its totient is φ = 110357800.

The previous prime is 121393589. The next prime is 121393631. The reversal of 121393591 is 195393121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121393591 - 2¹ = 121393589 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 (121393501) 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, 5517880 + ... + 5517901.

It is an arithmetic number, because the mean of its divisors is an integer number (33107346).

Almost surely, 2^121393591 is an apocalyptic number.

121393591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121393591 is a deficient number, since it is larger than the sum of its proper divisors (11035793).

121393591 is a wasteful number, since it uses less digits than its factorization.

121393591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035792.

The product of its digits is 7290, while the sum is 34.

The square root of 121393591 is about 11017.8759749781. The cubic root of 121393591 is about 495.1444546601.

The spelling of 121393591 in words is "one hundred twenty-one million, three hundred ninety-three thousand, five hundred ninety-one".