121351691 has 4 divisors (see below), whose sum is σ = 121471800. Its totient is φ = 121231584.

The previous prime is 121351669. The next prime is 121351733. The reversal of 121351691 is 196153121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121351691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121351621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58526 + ... + 60563.

It is an arithmetic number, because the mean of its divisors is an integer number (30367950).

Almost surely, 2^121351691 is an apocalyptic number.

121351691 is a deficient number, since it is larger than the sum of its proper divisors (120109).

121351691 is a wasteful number, since it uses less digits than its factorization.

121351691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120108.

The product of its digits is 1620, while the sum is 29.

The square root of 121351691 is about 11015.9743554531. The cubic root of 121351691 is about 495.0874803726.

The spelling of 121351691 in words is "one hundred twenty-one million, three hundred fifty-one thousand, six hundred ninety-one".