71921125 has 8 divisors (see below), whose sum is σ = 89757720. Its totient is φ = 57536800.

The previous prime is 71921123. The next prime is 71921141. The reversal of 71921125 is 52112917.

It can be written as a sum of positive squares in 4 ways, for example, as 12723489 + 59197636 = 3567^2 + 7694^2 .

It is not a de Polignac number, because 71921125 - 2¹ = 71921123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71921093 and 71921102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71921123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287560 + ... + 287809.

It is an arithmetic number, because the mean of its divisors is an integer number (11219715).

Almost surely, 2^71921125 is an apocalyptic number.

It is an amenable number.

71921125 is a deficient number, since it is larger than the sum of its proper divisors (17836595).

71921125 is an equidigital number, since it uses as much as digits as its factorization.

71921125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575384 (or 575374 counting only the distinct ones).

The product of its digits is 1260, while the sum is 28.

The square root of 71921125 is about 8480.6323467062. The cubic root of 71921125 is about 415.8647955743.

The spelling of 71921125 in words is "seventy-one million, nine hundred twenty-one thousand, one hundred twenty-five".