121315431 has 16 divisors (see below), whose sum is σ = 167917568. Its totient is φ = 77824800.

The previous prime is 121315421. The next prime is 121315459. The reversal of 121315431 is 134513121.

It is not a de Polignac number, because 121315431 - 2⁶ = 121315367 is a prime.

It is a super-2 number, since 2×121315431² = 29434867597431522, 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 = 121315398 and 121315407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121315421) 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, 13230 + ... + 20436.

It is an arithmetic number, because the mean of its divisors is an integer number (10494848).

Almost surely, 2^121315431 is an apocalyptic number.

121315431 is a deficient number, since it is larger than the sum of its proper divisors (46602137).

121315431 is a wasteful number, since it uses less digits than its factorization.

121315431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422.

The product of its digits is 360, while the sum is 21.

The square root of 121315431 is about 11014.3284407176. The cubic root of 121315431 is about 495.0381645914.

Adding to 121315431 its reverse (134513121), we get a palindrome (255828552).

The spelling of 121315431 in words is "one hundred twenty-one million, three hundred fifteen thousand, four hundred thirty-one".