121642091 has 2 divisors, whose sum is σ = 121642092. Its totient is φ = 121642090.

The previous prime is 121642043. The next prime is 121642111. The reversal of 121642091 is 190246121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121642091 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121642091.

It is not a weakly prime, because it can be changed into another prime (121642291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60821045 + 60821046.

It is an arithmetic number, because the mean of its divisors is an integer number (60821046).

Almost surely, 2^121642091 is an apocalyptic number.

121642091 is a deficient number, since it is larger than the sum of its proper divisors (1).

121642091 is an equidigital number, since it uses as much as digits as its factorization.

121642091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 121642091 is about 11029.1473378498. The cubic root of 121642091 is about 495.4820878971.

The spelling of 121642091 in words is "one hundred twenty-one million, six hundred forty-two thousand, ninety-one".