115217431 has 4 divisors (see below), whose sum is σ = 131677072. Its totient is φ = 98757792.

The previous prime is 115217429. The next prime is 115217461. The reversal of 115217431 is 134712511.

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

It is not a de Polignac number, because 115217431 - 2¹ = 115217429 is a prime.

It is a super-2 number, since 2×115217431² = 26550112812479522, 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 = 115217396 and 115217405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115217461) 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, 8229810 + ... + 8229823.

It is an arithmetic number, because the mean of its divisors is an integer number (32919268).

Almost surely, 2^115217431 is an apocalyptic number.

115217431 is a deficient number, since it is larger than the sum of its proper divisors (16459641).

115217431 is an equidigital number, since it uses as much as digits as its factorization.

115217431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16459640.

The product of its digits is 840, while the sum is 25.

The square root of 115217431 is about 10733.9382800536. The cubic root of 115217431 is about 486.6006998117.

Adding to 115217431 its reverse (134712511), we get a palindrome (249929942).

The spelling of 115217431 in words is "one hundred fifteen million, two hundred seventeen thousand, four hundred thirty-one".