115531903 has 2 divisors, whose sum is σ = 115531904. Its totient is φ = 115531902.

The previous prime is 115531873. The next prime is 115531939. The reversal of 115531903 is 309135511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115531903 - 2²¹ = 113434751 is a prime.

It is a super-2 number, since 2×115531903² = 26695241221602818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115531943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57765951 + 57765952.

It is an arithmetic number, because the mean of its divisors is an integer number (57765952).

Almost surely, 2^115531903 is an apocalyptic number.

115531903 is a deficient number, since it is larger than the sum of its proper divisors (1).

115531903 is an equidigital number, since it uses as much as digits as its factorization.

115531903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 115531903 is about 10748.5767895103. The cubic root of 115531903 is about 487.0430035096.

It can be divided in two parts, 11553 and 1903, that added together give a square (13456 = 116²).

The spelling of 115531903 in words is "one hundred fifteen million, five hundred thirty-one thousand, nine hundred three".