121777157 has 8 divisors (see below), whose sum is σ = 128682240. Its totient is φ = 115006320.

The previous prime is 121777151. The next prime is 121777169. The reversal of 121777157 is 751777121.

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 121777157 - 2²⁰ = 120728581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121777157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121777151) 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, 31694 + ... + 35327.

It is an arithmetic number, because the mean of its divisors is an integer number (16085280).

Almost surely, 2^121777157 is an apocalyptic number.

It is an amenable number.

121777157 is a deficient number, since it is larger than the sum of its proper divisors (6905083).

121777157 is an equidigital number, since it uses as much as digits as its factorization.

121777157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67123.

The product of its digits is 24010, while the sum is 38.

The square root of 121777157 is about 11035.2687778776. The cubic root of 121777157 is about 495.6654071990.

The spelling of 121777157 in words is "one hundred twenty-one million, seven hundred seventy-seven thousand, one hundred fifty-seven".