121331791 has 8 divisors (see below), whose sum is σ = 141495200. Its totient is φ = 103998384.

The previous prime is 121331761. The next prime is 121331797. The reversal of 121331791 is 197133121.

It is not a de Polignac number, because 121331791 - 2¹¹ = 121329743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121331797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176526 + ... + 177211.

It is an arithmetic number, because the mean of its divisors is an integer number (17686900).

Almost surely, 2^121331791 is an apocalyptic number.

121331791 is a deficient number, since it is larger than the sum of its proper divisors (20163409).

121331791 is an frugal number, since it uses more digits than its factorization.

121331791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353758 (or 353744 counting only the distinct ones).

The product of its digits is 1134, while the sum is 28.

The square root of 121331791 is about 11015.0710846549. The cubic root of 121331791 is about 495.0604163920.

It can be divided in two parts, 12133 and 1791, that added together give a square (13924 = 118²).

The spelling of 121331791 in words is "one hundred twenty-one million, three hundred thirty-one thousand, seven hundred ninety-one".