72226157 has 2 divisors, whose sum is σ = 72226158. Its totient is φ = 72226156.

The previous prime is 72226151. The next prime is 72226171. The reversal of 72226157 is 75162227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42784681 + 29441476 = 6541^2 + 5426^2 .

It is a cyclic number.

It is not a de Polignac number, because 72226157 - 2¹² = 72222061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72226151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36113078 + 36113079.

It is an arithmetic number, because the mean of its divisors is an integer number (36113079).

Almost surely, 2^72226157 is an apocalyptic number.

It is an amenable number.

72226157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72226157 is an equidigital number, since it uses as much as digits as its factorization.

72226157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 32.

The square root of 72226157 is about 8498.5973548580. The cubic root of 72226157 is about 416.4518885256.

The spelling of 72226157 in words is "seventy-two million, two hundred twenty-six thousand, one hundred fifty-seven".