121430631 has 8 divisors (see below), whose sum is σ = 185037184. Its totient is φ = 69388920.

The previous prime is 121430611. The next prime is 121430641. The reversal of 121430631 is 136034121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121430631 - 2⁹ = 121430119 is a prime.

It is a super-2 number, since 2×121430631² = 29490796290116322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5782411 = 121430631 / (1 + 2 + 1 + 4 + 3 + 0 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121430598 and 121430607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121430611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2891185 + ... + 2891226.

It is an arithmetic number, because the mean of its divisors is an integer number (23129648).

Almost surely, 2^121430631 is an apocalyptic number.

121430631 is a deficient number, since it is larger than the sum of its proper divisors (63606553).

121430631 is an equidigital number, since it uses as much as digits as its factorization.

121430631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782421.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 121430631 is about 11019.5567515214. The cubic root of 121430631 is about 495.1948095578.

Adding to 121430631 its reverse (136034121), we get a palindrome (257464752).

The spelling of 121430631 in words is "one hundred twenty-one million, four hundred thirty thousand, six hundred thirty-one".