121770391 has 8 divisors (see below), whose sum is σ = 126478800. Its totient is φ = 117096000.

The previous prime is 121770377. The next prime is 121770401. The reversal of 121770391 is 193077121.

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 121770391 - 2¹¹ = 121768343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121770301) 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, 1086 + ... + 15643.

It is an arithmetic number, because the mean of its divisors is an integer number (15809850).

Almost surely, 2^121770391 is an apocalyptic number.

121770391 is a deficient number, since it is larger than the sum of its proper divisors (4708409).

121770391 is a wasteful number, since it uses less digits than its factorization.

121770391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17009.

The product of its (nonzero) digits is 2646, while the sum is 31.

The square root of 121770391 is about 11034.9622110816. The cubic root of 121770391 is about 495.6562272226.

The spelling of 121770391 in words is "one hundred twenty-one million, seven hundred seventy thousand, three hundred ninety-one".