121190391 has 32 divisors (see below), whose sum is σ = 212275200. Its totient is φ = 66860640.

The previous prime is 121190369. The next prime is 121190413. The reversal of 121190391 is 193091121.

It is an interprime number because it is at equal distance from previous prime (121190369) and next prime (121190413).

It is not a de Polignac number, because 121190391 - 2⁵ = 121190359 is a prime.

It is a super-2 number, since 2×121190391² = 29374221741465762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121190351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5575 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (6633600).

Almost surely, 2^121190391 is an apocalyptic number.

121190391 is a deficient number, since it is larger than the sum of its proper divisors (91084809).

121190391 is a wasteful number, since it uses less digits than its factorization.

121190391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22156 (or 22150 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 121190391 is about 11008.6507347631. The cubic root of 121190391 is about 494.8680272603.

The spelling of 121190391 in words is "one hundred twenty-one million, one hundred ninety thousand, three hundred ninety-one".