121931777 has 4 divisors (see below), whose sum is σ = 133016496. Its totient is φ = 110847060.

The previous prime is 121931767. The next prime is 121931857. The reversal of 121931777 is 777139121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121931777 - 2⁸ = 121931521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121931777.

It is not an unprimeable number, because it can be changed into a prime (121931767) 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, 5542343 + ... + 5542364.

It is an arithmetic number, because the mean of its divisors is an integer number (33254124).

Almost surely, 2^121931777 is an apocalyptic number.

It is an amenable number.

121931777 is a deficient number, since it is larger than the sum of its proper divisors (11084719).

121931777 is a wasteful number, since it uses less digits than its factorization.

121931777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11084718.

The product of its digits is 18522, while the sum is 38.

The square root of 121931777 is about 11042.2722752158. The cubic root of 121931777 is about 495.8750999788.

The spelling of 121931777 in words is "one hundred twenty-one million, nine hundred thirty-one thousand, seven hundred seventy-seven".