71872169 has 2 divisors, whose sum is σ = 71872170. Its totient is φ = 71872168.

The previous prime is 71872153. The next prime is 71872183. The reversal of 71872169 is 96127817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37356544 + 34515625 = 6112^2 + 5875^2 .

It is a cyclic number.

It is not a de Polignac number, because 71872169 - 2⁴ = 71872153 is a prime.

It is a super-2 number, since 2×71872169² = 10331217353529122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71872109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35936084 + 35936085.

It is an arithmetic number, because the mean of its divisors is an integer number (35936085).

Almost surely, 2^71872169 is an apocalyptic number.

It is an amenable number.

71872169 is a deficient number, since it is larger than the sum of its proper divisors (1).

71872169 is an equidigital number, since it uses as much as digits as its factorization.

71872169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 71872169 is about 8477.7455139913. The cubic root of 71872169 is about 415.7704158026.

The spelling of 71872169 in words is "seventy-one million, eight hundred seventy-two thousand, one hundred sixty-nine".