125171869 has 2 divisors, whose sum is σ = 125171870. Its totient is φ = 125171868.

The previous prime is 125171821. The next prime is 125171873. The reversal of 125171869 is 968171521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108930969 + 16240900 = 10437^2 + 4030^2 .

It is an emirp because it is prime and its reverse (968171521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125171869 is a prime.

It is a super-2 number, since 2×125171869² = 31335993577906322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125171899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62585934 + 62585935.

It is an arithmetic number, because the mean of its divisors is an integer number (62585935).

Almost surely, 2^125171869 is an apocalyptic number.

It is an amenable number.

125171869 is a deficient number, since it is larger than the sum of its proper divisors (1).

125171869 is an equidigital number, since it uses as much as digits as its factorization.

125171869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 40.

The square root of 125171869 is about 11188.0234626139. The cubic root of 125171869 is about 500.2290537194.

The spelling of 125171869 in words is "one hundred twenty-five million, one hundred seventy-one thousand, eight hundred sixty-nine".