125165161 has 4 divisors (see below), whose sum is σ = 136543824. Its totient is φ = 113786500.

The previous prime is 125165123. The next prime is 125165167. The reversal of 125165161 is 161561521.

It is a happy number.

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: 161561521 = 11 ⋅14687411.

It is a cyclic number.

It is not a de Polignac number, because 125165161 - 2⁹ = 125164649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125165167) 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, 5689315 + ... + 5689336.

It is an arithmetic number, because the mean of its divisors is an integer number (34135956).

Almost surely, 2^125165161 is an apocalyptic number.

125165161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125165161 is a deficient number, since it is larger than the sum of its proper divisors (11378663).

125165161 is a wasteful number, since it uses less digits than its factorization.

125165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378662.

The product of its digits is 1800, while the sum is 28.

The square root of 125165161 is about 11187.7236737417. The cubic root of 125165161 is about 500.2201177488.

The spelling of 125165161 in words is "one hundred twenty-five million, one hundred sixty-five thousand, one hundred sixty-one".