72134261 has 2 divisors, whose sum is σ = 72134262. Its totient is φ = 72134260.

The previous prime is 72134243. The next prime is 72134291. The reversal of 72134261 is 16243127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 34692100 = 6119^2 + 5890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72134261 is a prime.

It is a super-2 number, since 2×72134261² = 10406703220032242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72134261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72134291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36067130 + 36067131.

It is an arithmetic number, because the mean of its divisors is an integer number (36067131).

Almost surely, 2^72134261 is an apocalyptic number.

It is an amenable number.

72134261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72134261 is an equidigital number, since it uses as much as digits as its factorization.

72134261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 72134261 is about 8493.1890947983. The cubic root of 72134261 is about 416.2751912057.

Adding to 72134261 its reverse (16243127), we get a palindrome (88377388).

The spelling of 72134261 in words is "seventy-two million, one hundred thirty-four thousand, two hundred sixty-one".