125312261 has 4 divisors (see below), whose sum is σ = 129354624. Its totient is φ = 121269900.

The previous prime is 125312251. The next prime is 125312309. The reversal of 125312261 is 162213521.

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: 162213521 = 457 ⋅354953.

It is a cyclic number.

It is not a de Polignac number, because 125312261 - 2²² = 121117957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125312251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021135 + ... + 2021196.

It is an arithmetic number, because the mean of its divisors is an integer number (32338656).

Almost surely, 2^125312261 is an apocalyptic number.

It is an amenable number.

125312261 is a deficient number, since it is larger than the sum of its proper divisors (4042363).

125312261 is an equidigital number, since it uses as much as digits as its factorization.

125312261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042362.

The product of its digits is 720, while the sum is 23.

The square root of 125312261 is about 11194.2959135445. The cubic root of 125312261 is about 500.4160017890.

Adding to 125312261 its reverse (162213521), we get a palindrome (287525782).

The spelling of 125312261 in words is "one hundred twenty-five million, three hundred twelve thousand, two hundred sixty-one".