125399081 has 4 divisors (see below), whose sum is σ = 125624772. Its totient is φ = 125173392.

The previous prime is 125399077. The next prime is 125399083. The reversal of 125399081 is 180993521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180993521 = 881 ⋅205441.

It can be written as a sum of positive squares in 2 ways, for example, as 3097600 + 122301481 = 1760^2 + 11059^2 .

It is a cyclic number.

It is not a de Polignac number, because 125399081 - 2² = 125399077 is a prime.

It is a super-2 number, since 2×125399081² = 31449859031289122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125399083) 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, 112010 + ... + 113123.

It is an arithmetic number, because the mean of its divisors is an integer number (31406193).

Almost surely, 2^125399081 is an apocalyptic number.

It is an amenable number.

125399081 is a deficient number, since it is larger than the sum of its proper divisors (225691).

125399081 is an equidigital number, since it uses as much as digits as its factorization.

125399081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225690.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 125399081 is about 11198.1731099318. The cubic root of 125399081 is about 500.5315427244.

The spelling of 125399081 in words is "one hundred twenty-five million, three hundred ninety-nine thousand, eighty-one".