72204281 has 2 divisors, whose sum is σ = 72204282. Its totient is φ = 72204280.

The previous prime is 72204269. The next prime is 72204347. The reversal of 72204281 is 18240227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 17147881 = 7420^2 + 4141^2 .

It is an emirp because it is prime and its reverse (18240227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72204281 - 2⁶ = 72204217 is a prime.

It is a super-2 number, since 2×72204281² = 10426916389453922, 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 72204281.

It is not a weakly prime, because it can be changed into another prime (72204241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36102140 + 36102141.

It is an arithmetic number, because the mean of its divisors is an integer number (36102141).

Almost surely, 2^72204281 is an apocalyptic number.

It is an amenable number.

72204281 is a deficient number, since it is larger than the sum of its proper divisors (1).

72204281 is an equidigital number, since it uses as much as digits as its factorization.

72204281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72204281 is about 8497.3102214760. The cubic root of 72204281 is about 416.4098390253.

The spelling of 72204281 in words is "seventy-two million, two hundred four thousand, two hundred eighty-one".