72543157 has 2 divisors, whose sum is σ = 72543158. Its totient is φ = 72543156.

The previous prime is 72543143. The next prime is 72543187. The reversal of 72543157 is 75134527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42172036 + 30371121 = 6494^2 + 5511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72543157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72543187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36271578 + 36271579.

It is an arithmetic number, because the mean of its divisors is an integer number (36271579).

Almost surely, 2^72543157 is an apocalyptic number.

It is an amenable number.

72543157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72543157 is an equidigital number, since it uses as much as digits as its factorization.

72543157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 34.

The square root of 72543157 is about 8517.2270722342. The cubic root of 72543157 is about 417.0602672892.

The spelling of 72543157 in words is "seventy-two million, five hundred forty-three thousand, one hundred fifty-seven".