125109997 has 4 divisors (see below), whose sum is σ = 125139580. Its totient is φ = 125080416.

The previous prime is 125109979. The next prime is 125110019. The reversal of 125109997 is 799901521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799901521 = 23 ⋅34778327.

It can be written as a sum of positive squares in 2 ways, for example, as 7365796 + 117744201 = 2714^2 + 10851^2 .

It is a cyclic number.

It is not a de Polignac number, because 125109997 - 2¹¹ = 125107949 is a prime.

It is a super-2 number, since 2×125109997² = 31305022698680018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125109947) 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, 7122 + ... + 17347.

It is an arithmetic number, because the mean of its divisors is an integer number (31284895).

Almost surely, 2^125109997 is an apocalyptic number.

It is an amenable number.

125109997 is a deficient number, since it is larger than the sum of its proper divisors (29583).

125109997 is an equidigital number, since it uses as much as digits as its factorization.

125109997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29582.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 125109997 is about 11185.2580211634. The cubic root of 125109997 is about 500.1466196678.

The spelling of 125109997 in words is "one hundred twenty-five million, one hundred nine thousand, nine hundred ninety-seven".