121381791 has 16 divisors (see below), whose sum is σ = 167714400. Its totient is φ = 77995008.

The previous prime is 121381789. The next prime is 121381811. The reversal of 121381791 is 197183121.

It is not a de Polignac number, because 121381791 - 2¹ = 121381789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121381721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80775 + ... + 82263.

It is an arithmetic number, because the mean of its divisors is an integer number (10482150).

Almost surely, 2^121381791 is an apocalyptic number.

121381791 is a deficient number, since it is larger than the sum of its proper divisors (46332609).

121381791 is a wasteful number, since it uses less digits than its factorization.

121381791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458.

The product of its digits is 3024, while the sum is 33.

The square root of 121381791 is about 11017.3404685523. The cubic root of 121381791 is about 495.1284107217.

The spelling of 121381791 in words is "one hundred twenty-one million, three hundred eighty-one thousand, seven hundred ninety-one".