121440131 has 4 divisors (see below), whose sum is σ = 121717200. Its totient is φ = 121163064.

The previous prime is 121440103. The next prime is 121440167. The reversal of 121440131 is 131044121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121440131 - 2¹⁰ = 121439107 is a prime.

It is a super-2 number, since 2×121440131² = 29495410834594322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121440101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137876 + ... + 138753.

It is an arithmetic number, because the mean of its divisors is an integer number (30429300).

Almost surely, 2^121440131 is an apocalyptic number.

121440131 is a deficient number, since it is larger than the sum of its proper divisors (277069).

121440131 is an equidigital number, since it uses as much as digits as its factorization.

121440131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277068.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 121440131 is about 11019.9877949116. The cubic root of 121440131 is about 495.2077229059.

Adding to 121440131 its reverse (131044121), we get a palindrome (252484252).

The spelling of 121440131 in words is "one hundred twenty-one million, four hundred forty thousand, one hundred thirty-one".