72223051 has 4 divisors (see below), whose sum is σ = 72774504. Its totient is φ = 71671600.

The previous prime is 72223049. The next prime is 72223057. The reversal of 72223051 is 15032227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15032227 = 7 ⋅2147461.

It is a cyclic number.

It is not a de Polignac number, because 72223051 - 2¹ = 72223049 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72223057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275530 + ... + 275791.

It is an arithmetic number, because the mean of its divisors is an integer number (18193626).

Almost surely, 2^72223051 is an apocalyptic number.

72223051 is a deficient number, since it is larger than the sum of its proper divisors (551453).

72223051 is a wasteful number, since it uses less digits than its factorization.

72223051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551452.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 72223051 is about 8498.4146168565. The cubic root of 72223051 is about 416.4459187673.

Adding to 72223051 its reverse (15032227), we get a palindrome (87255278).

The spelling of 72223051 in words is "seventy-two million, two hundred twenty-three thousand, fifty-one".