121165381 has 8 divisors (see below), whose sum is σ = 123833600. Its totient is φ = 118525680.

The previous prime is 121165379. The next prime is 121165397. The reversal of 121165381 is 183561121.

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 121165381 - 2¹ = 121165379 is a prime.

It is a super-2 number, since 2×121165381² = 29362099105750322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121165301) 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, 1576 + ... + 15646.

It is an arithmetic number, because the mean of its divisors is an integer number (15479200).

Almost surely, 2^121165381 is an apocalyptic number.

It is an amenable number.

121165381 is a deficient number, since it is larger than the sum of its proper divisors (2668219).

121165381 is a wasteful number, since it uses less digits than its factorization.

121165381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14259.

The product of its digits is 1440, while the sum is 28.

The square root of 121165381 is about 11007.5147512960. The cubic root of 121165381 is about 494.8339830297.

The spelling of 121165381 in words is "one hundred twenty-one million, one hundred sixty-five thousand, three hundred eighty-one".