71897189 has 32 divisors (see below), whose sum is σ = 91499520. Its totient is φ = 54991872.

The previous prime is 71897183. The next prime is 71897191. The reversal of 71897189 is 98179817.

It is not a de Polignac number, because 71897189 - 2⁸ = 71896933 is a prime.

It is a super-2 number, since 2×71897189² = 10338411572203442, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71897183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524729 + ... + 524865.

It is an arithmetic number, because the mean of its divisors is an integer number (2859360).

Almost surely, 2^71897189 is an apocalyptic number.

71897189 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

71897189 is a deficient number, since it is larger than the sum of its proper divisors (19602331).

71897189 is a wasteful number, since it uses less digits than its factorization.

71897189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its digits is 254016, while the sum is 50.

The square root of 71897189 is about 8479.2210137488. The cubic root of 71897189 is about 415.8186559354.

The spelling of 71897189 in words is "seventy-one million, eight hundred ninety-seven thousand, one hundred eighty-nine".