71399261 has 4 divisors (see below), whose sum is σ = 71548800. Its totient is φ = 71249724.

The previous prime is 71399257. The next prime is 71399267. The reversal of 71399261 is 16299317.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71399261 - 2² = 71399257 is a prime.

It is a super-2 number, since 2×71399261² = 10195708942692242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71399267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74051 + ... + 75008.

It is an arithmetic number, because the mean of its divisors is an integer number (17887200).

Almost surely, 2^71399261 is an apocalyptic number.

It is an amenable number.

71399261 is a deficient number, since it is larger than the sum of its proper divisors (149539).

71399261 is a wasteful number, since it uses less digits than its factorization.

71399261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149538.

The product of its digits is 20412, while the sum is 38.

The square root of 71399261 is about 8449.8083410217. The cubic root of 71399261 is about 414.8565062522.

The spelling of 71399261 in words is "seventy-one million, three hundred ninety-nine thousand, two hundred sixty-one".