121440031 has 4 divisors (see below), whose sum is σ = 124722232. Its totient is φ = 118157832.

The previous prime is 121440029. The next prime is 121440047. The reversal of 121440031 is 130044121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130044121 = 8537 ⋅15233.

It is a cyclic number.

It is not a de Polignac number, because 121440031 - 2¹ = 121440029 is a prime.

It is a super-2 number, since 2×121440031² = 29495362258561922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121439987 and 121440014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121440071) 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, 1641045 + ... + 1641118.

It is an arithmetic number, because the mean of its divisors is an integer number (31180558).

Almost surely, 2^121440031 is an apocalyptic number.

121440031 is a deficient number, since it is larger than the sum of its proper divisors (3282201).

121440031 is an equidigital number, since it uses as much as digits as its factorization.

121440031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282200.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121440031 is about 11019.9832577005. The cubic root of 121440031 is about 495.2075869794.

Adding to 121440031 its reverse (130044121), we get a palindrome (251484152).

The spelling of 121440031 in words is "one hundred twenty-one million, four hundred forty thousand, thirty-one".