121973791 has 2 divisors, whose sum is σ = 121973792. Its totient is φ = 121973790.

The previous prime is 121973783. The next prime is 121973801. The reversal of 121973791 is 197379121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121973791 - 2³ = 121973783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121973741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60986895 + 60986896.

It is an arithmetic number, because the mean of its divisors is an integer number (60986896).

Almost surely, 2^121973791 is an apocalyptic number.

121973791 is a deficient number, since it is larger than the sum of its proper divisors (1).

121973791 is an equidigital number, since it uses as much as digits as its factorization.

121973791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 121973791 is about 11044.1745277771. The cubic root of 121973791 is about 495.9320479556.

It can be divided in two parts, 121 and 973791, that multiplied together give a palindrome (117828711).

The spelling of 121973791 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, seven hundred ninety-one".