130731257 has 4 divisors (see below), whose sum is σ = 130852176. Its totient is φ = 130610340.

The previous prime is 130731239. The next prime is 130731277. The reversal of 130731257 is 752137031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752137031 = 73 ⋅10303247.

It is a cyclic number.

It is not a de Polignac number, because 130731257 - 2⁶ = 130731193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130731277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58823 + ... + 61004.

It is an arithmetic number, because the mean of its divisors is an integer number (32713044).

Almost surely, 2^130731257 is an apocalyptic number.

It is an amenable number.

130731257 is a deficient number, since it is larger than the sum of its proper divisors (120919).

130731257 is a wasteful number, since it uses less digits than its factorization.

130731257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120918.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 130731257 is about 11433.7770224891. Note that the first 3 decimals coincide. The cubic root of 130731257 is about 507.5277725101.

Adding to 130731257 its reverse (752137031), we get a palindrome (882868288).

The spelling of 130731257 in words is "one hundred thirty million, seven hundred thirty-one thousand, two hundred fifty-seven".