121691091 has 8 divisors (see below), whose sum is σ = 169309440. Its totient is φ = 77600072.

The previous prime is 121691041. The next prime is 121691107. The reversal of 121691091 is 190196121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121691091 - 2⁹ = 121690579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121691041) 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, 881751 + ... + 881888.

It is an arithmetic number, because the mean of its divisors is an integer number (21163680).

Almost surely, 2^121691091 is an apocalyptic number.

121691091 is a deficient number, since it is larger than the sum of its proper divisors (47618349).

121691091 is a wasteful number, since it uses less digits than its factorization.

121691091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763665.

The product of its (nonzero) digits is 972, while the sum is 30.

The square root of 121691091 is about 11031.3685007799. The cubic root of 121691091 is about 495.5486091779.

The spelling of 121691091 in words is "one hundred twenty-one million, six hundred ninety-one thousand, ninety-one".