72522251 has 2 divisors, whose sum is σ = 72522252. Its totient is φ = 72522250.

The previous prime is 72522227. The next prime is 72522253. The reversal of 72522251 is 15222527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72522251 - 2¹⁸ = 72260107 is a prime.

Together with 72522253, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72522251.

It is not a weakly prime, because it can be changed into another prime (72522253) 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 as a sum of consecutive naturals, namely, 36261125 + 36261126.

It is an arithmetic number, because the mean of its divisors is an integer number (36261126).

Almost surely, 2^72522251 is an apocalyptic number.

72522251 is a deficient number, since it is larger than the sum of its proper divisors (1).

72522251 is an equidigital number, since it uses as much as digits as its factorization.

72522251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 26.

The square root of 72522251 is about 8515.9997064349. Note that the first 3 decimals coincide. The cubic root of 72522251 is about 417.0201996476.

Adding to 72522251 its reverse (15222527), we get a palindrome (87744778).

The spelling of 72522251 in words is "seventy-two million, five hundred twenty-two thousand, two hundred fifty-one".