121132991 has 16 divisors (see below), whose sum is σ = 140835840. Its totient is φ = 102042720.

The previous prime is 121132987. The next prime is 121132993. The reversal of 121132991 is 199231121.

It is not a de Polignac number, because 121132991 - 2² = 121132987 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 (121132993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174956 + ... + 175646.

It is an arithmetic number, because the mean of its divisors is an integer number (8802240).

Almost surely, 2^121132991 is an apocalyptic number.

121132991 is a deficient number, since it is larger than the sum of its proper divisors (19702849).

121132991 is an equidigital number, since it uses as much as digits as its factorization.

121132991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094.

The product of its digits is 972, while the sum is 29.

The square root of 121132991 is about 11006.0433853406. The cubic root of 121132991 is about 494.7898859976.

The spelling of 121132991 in words is "one hundred twenty-one million, one hundred thirty-two thousand, nine hundred ninety-one".