115278731 has 2 divisors, whose sum is σ = 115278732. Its totient is φ = 115278730.

The previous prime is 115278703. The next prime is 115278781. The reversal of 115278731 is 137872511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115278731 - 2²² = 111084427 is a prime.

It is a super-2 number, since 2×115278731² = 26578371641940722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 115278691 and 115278700.

It is not a weakly prime, because it can be changed into another prime (115278701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57639365 + 57639366.

It is an arithmetic number, because the mean of its divisors is an integer number (57639366).

Almost surely, 2^115278731 is an apocalyptic number.

115278731 is a deficient number, since it is larger than the sum of its proper divisors (1).

115278731 is an equidigital number, since it uses as much as digits as its factorization.

115278731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 35.

The square root of 115278731 is about 10736.7933294816. The cubic root of 115278731 is about 486.6869811270.

The spelling of 115278731 in words is "one hundred fifteen million, two hundred seventy-eight thousand, seven hundred thirty-one".