125631257 has 4 divisors (see below), whose sum is σ = 128695476. Its totient is φ = 122567040.

The previous prime is 125631229. The next prime is 125631271. The reversal of 125631257 is 752136521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752136521 = 43 ⋅17491547.

It can be written as a sum of positive squares in 2 ways, for example, as 26050816 + 99580441 = 5104^2 + 9979^2 .

It is a de Polignac number, because none of the positive numbers 2^k-125631257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125631157) 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, 1532048 + ... + 1532129.

It is an arithmetic number, because the mean of its divisors is an integer number (32173869).

Almost surely, 2^125631257 is an apocalyptic number.

It is an amenable number.

125631257 is a deficient number, since it is larger than the sum of its proper divisors (3064219).

125631257 is an equidigital number, since it uses as much as digits as its factorization.

125631257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064218.

The product of its digits is 12600, while the sum is 32.

The square root of 125631257 is about 11208.5350068597. The cubic root of 125631257 is about 500.8402631247.

Adding to 125631257 its reverse (752136521), we get a palindrome (877767778).

The spelling of 125631257 in words is "one hundred twenty-five million, six hundred thirty-one thousand, two hundred fifty-seven".