125391819 has 16 divisors (see below), whose sum is σ = 191842560. Its totient is φ = 71364000.

The previous prime is 125391809. The next prime is 125391821. The reversal of 125391819 is 918193521.

It is not a de Polignac number, because 125391819 - 2¹² = 125387723 is a prime.

It is a super-2 number, since 2×125391819² = 31446216544257522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125391809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6624 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (11990160).

Almost surely, 2^125391819 is an apocalyptic number.

125391819 is a deficient number, since it is larger than the sum of its proper divisors (66450741).

125391819 is a wasteful number, since it uses less digits than its factorization.

125391819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24050.

The product of its digits is 19440, while the sum is 39.

The square root of 125391819 is about 11197.8488559187. The cubic root of 125391819 is about 500.5218804255.

The spelling of 125391819 in words is "one hundred twenty-five million, three hundred ninety-one thousand, eight hundred nineteen".