125817451 has 4 divisors (see below), whose sum is σ = 125865232. Its totient is φ = 125769672.

The previous prime is 125817443. The next prime is 125817463. The reversal of 125817451 is 154718521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154718521 = 1423 ⋅108727.

It is a cyclic number.

It is not a de Polignac number, because 125817451 - 2³ = 125817443 is a prime.

It is a super-2 number, since 2×125817451² = 31660061952274802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125817421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19695 + ... + 25288.

It is an arithmetic number, because the mean of its divisors is an integer number (31466308).

Almost surely, 2^125817451 is an apocalyptic number.

125817451 is a deficient number, since it is larger than the sum of its proper divisors (47781).

125817451 is an equidigital number, since it uses as much as digits as its factorization.

125817451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47780.

The product of its digits is 11200, while the sum is 34.

The square root of 125817451 is about 11216.8378342561. The cubic root of 125817451 is about 501.0875673460.

The spelling of 125817451 in words is "one hundred twenty-five million, eight hundred seventeen thousand, four hundred fifty-one".