71236261 has 4 divisors (see below), whose sum is σ = 71372992. Its totient is φ = 71099532.

The previous prime is 71236259. The next prime is 71236271. The reversal of 71236261 is 16263217.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16263217 = 257 ⋅63281.

It is a cyclic number.

It is not a de Polignac number, because 71236261 - 2¹ = 71236259 is a prime.

It is a super-3 number, since 3×71236261³ (a number of 25 digits) contains 333 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 (71236201) 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, 67581 + ... + 68626.

It is an arithmetic number, because the mean of its divisors is an integer number (17843248).

Almost surely, 2^71236261 is an apocalyptic number.

It is an amenable number.

71236261 is a deficient number, since it is larger than the sum of its proper divisors (136731).

71236261 is a wasteful number, since it uses less digits than its factorization.

71236261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136730.

The product of its digits is 3024, while the sum is 28.

The square root of 71236261 is about 8440.1576407079. The cubic root of 71236261 is about 414.5405686474.

Adding to 71236261 its reverse (16263217), we get a palindrome (87499478).

The spelling of 71236261 in words is "seventy-one million, two hundred thirty-six thousand, two hundred sixty-one".