121742791 has 2 divisors, whose sum is σ = 121742792. Its totient is φ = 121742790.

The previous prime is 121742773. The next prime is 121742801. The reversal of 121742791 is 197247121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121742791 - 2¹¹ = 121740743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121742741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60871395 + 60871396.

It is an arithmetic number, because the mean of its divisors is an integer number (60871396).

Almost surely, 2^121742791 is an apocalyptic number.

121742791 is a deficient number, since it is larger than the sum of its proper divisors (1).

121742791 is an equidigital number, since it uses as much as digits as its factorization.

121742791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 34.

The square root of 121742791 is about 11033.7115695490. The cubic root of 121742791 is about 495.6187765598.

The spelling of 121742791 in words is "one hundred twenty-one million, seven hundred forty-two thousand, seven hundred ninety-one".