72011837 has 2 divisors, whose sum is σ = 72011838. Its totient is φ = 72011836.

The previous prime is 72011833. The next prime is 72011839. The reversal of 72011837 is 73811027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50537881 + 21473956 = 7109^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 72011837 - 2² = 72011833 is a prime.

It is a super-2 number, since 2×72011837² = 10371409336229138, which contains 22 as substring.

Together with 72011839, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72011833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36005918 + 36005919.

It is an arithmetic number, because the mean of its divisors is an integer number (36005919).

Almost surely, 2^72011837 is an apocalyptic number.

It is an amenable number.

72011837 is a deficient number, since it is larger than the sum of its proper divisors (1).

72011837 is an equidigital number, since it uses as much as digits as its factorization.

72011837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 72011837 is about 8485.9788474872. The cubic root of 72011837 is about 416.0395614650.

The spelling of 72011837 in words is "seventy-two million, eleven thousand, eight hundred thirty-seven".