121091139 has 64 divisors (see below), whose sum is σ = 202245120. Its totient is φ = 71124480.

The previous prime is 121091137. The next prime is 121091171. The reversal of 121091139 is 931190121.

It is not a de Polignac number, because 121091139 - 2¹ = 121091137 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (121091137) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1071547 + ... + 1071659.

It is an arithmetic number, because the mean of its divisors is an integer number (3160080).

Almost surely, 2^121091139 is an apocalyptic number.

121091139 is a deficient number, since it is larger than the sum of its proper divisors (81153981).

121091139 is a wasteful number, since it uses less digits than its factorization.

121091139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

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

The square root of 121091139 is about 11004.1419020294. The cubic root of 121091139 is about 494.7328953806.

The spelling of 121091139 in words is "one hundred twenty-one million, ninety-one thousand, one hundred thirty-nine".