71901921125 has 8 divisors (see below), whose sum is σ = 89733597720. Its totient is φ = 57521536800.

The previous prime is 71901921083. The next prime is 71901921127. The reversal of 71901921125 is 52112910917.

It can be written as a sum of positive squares in 4 ways, for example, as 13131555649 + 58770365476 = 114593^2 + 242426^2 .

It is not a de Polignac number, because 71901921125 - 2¹⁴ = 71901904741 is a prime.

It is a super-2 number, since 2×71901921125² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71901921127) 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, 287607560 + ... + 287607809.

It is an arithmetic number, because the mean of its divisors is an integer number (11216699715).

Almost surely, 2^71901921125 is an apocalyptic number.

It is an amenable number.

71901921125 is a deficient number, since it is larger than the sum of its proper divisors (17831676595).

71901921125 is an equidigital number, since it uses as much as digits as its factorization.

71901921125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575215384 (or 575215374 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 38.

The spelling of 71901921125 in words is "seventy-one billion, nine hundred one million, nine hundred twenty-one thousand, one hundred twenty-five".