71221739 has 8 divisors (see below), whose sum is σ = 72346560. Its totient is φ = 70102656.

The previous prime is 71221729. The next prime is 71221741. The reversal of 71221739 is 93712217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71221739 - 2⁴ = 71221723 is a prime.

It is a super-2 number, since 2×71221739² = 10145072212368242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71221729) 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, 28259 + ... + 30675.

It is an arithmetic number, because the mean of its divisors is an integer number (9043320).

Almost surely, 2^71221739 is an apocalyptic number.

71221739 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

71221739 is a deficient number, since it is larger than the sum of its proper divisors (1124821).

71221739 is a wasteful number, since it uses less digits than its factorization.

71221739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869.

The product of its digits is 5292, while the sum is 32.

The square root of 71221739 is about 8439.2973048708. The cubic root of 71221739 is about 414.5123977544.

The spelling of 71221739 in words is "seventy-one million, two hundred twenty-one thousand, seven hundred thirty-nine".