125404513 has 4 divisors (see below), whose sum is σ = 135051028. Its totient is φ = 115758000.

The previous prime is 125404501. The next prime is 125404537. The reversal of 125404513 is 315404521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315404521 = 97 ⋅3251593.

It can be written as a sum of positive squares in 2 ways, for example, as 84033889 + 41370624 = 9167^2 + 6432^2 .

It is a cyclic number.

It is not a de Polignac number, because 125404513 - 2⁵ = 125404481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125404553) 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, 4823238 + ... + 4823263.

It is an arithmetic number, because the mean of its divisors is an integer number (33762757).

Almost surely, 2^125404513 is an apocalyptic number.

125404513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

125404513 is a deficient number, since it is larger than the sum of its proper divisors (9646515).

125404513 is an equidigital number, since it uses as much as digits as its factorization.

125404513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9646514.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 125404513 is about 11198.4156468672. The cubic root of 125404513 is about 500.5387699121.

The spelling of 125404513 in words is "one hundred twenty-five million, four hundred four thousand, five hundred thirteen".