121569231 has 16 divisors (see below), whose sum is σ = 185474304. Its totient is φ = 69383424.

The previous prime is 121569221. The next prime is 121569233. The reversal of 121569231 is 132965121.

It is not a de Polignac number, because 121569231 - 2⁵ = 121569199 is a prime.

It is a super-2 number, since 2×121569231² = 29558155851862722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121569233) 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, 16831 + ... + 22943.

It is an arithmetic number, because the mean of its divisors is an integer number (11592144).

Almost surely, 2^121569231 is an apocalyptic number.

121569231 is a deficient number, since it is larger than the sum of its proper divisors (63905073).

121569231 is an equidigital number, since it uses as much as digits as its factorization.

121569231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070.

The product of its digits is 3240, while the sum is 30.

The square root of 121569231 is about 11025.8437772354. The cubic root of 121569231 is about 495.3831417873.

The spelling of 121569231 in words is "one hundred twenty-one million, five hundred sixty-nine thousand, two hundred thirty-one".