121047431 has 4 divisors (see below), whose sum is σ = 121106832. Its totient is φ = 120988032.

The previous prime is 121047391. The next prime is 121047469. The reversal of 121047431 is 134740121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121047431 is a prime.

It is a super-2 number, since 2×121047431² = 29304961103399522, 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 = 121047397 and 121047406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121047481) 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, 26531 + ... + 30756.

It is an arithmetic number, because the mean of its divisors is an integer number (30276708).

Almost surely, 2^121047431 is an apocalyptic number.

121047431 is a deficient number, since it is larger than the sum of its proper divisors (59401).

121047431 is an equidigital number, since it uses as much as digits as its factorization.

121047431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59400.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121047431 is about 11002.1557433078. The cubic root of 121047431 is about 494.6733633956.

Adding to 121047431 its reverse (134740121), we get a palindrome (255787552).

The spelling of 121047431 in words is "one hundred twenty-one million, forty-seven thousand, four hundred thirty-one".