72581149 has 2 divisors, whose sum is σ = 72581150. Its totient is φ = 72581148.

The previous prime is 72581147. The next prime is 72581183. The reversal of 72581149 is 94118527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43797924 + 28783225 = 6618^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 72581149 - 2¹ = 72581147 is a prime.

Together with 72581147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72581141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36290574 + 36290575.

It is an arithmetic number, because the mean of its divisors is an integer number (36290575).

Almost surely, 2^72581149 is an apocalyptic number.

It is an amenable number.

72581149 is a deficient number, since it is larger than the sum of its proper divisors (1).

72581149 is an equidigital number, since it uses as much as digits as its factorization.

72581149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 72581149 is about 8519.4570836410. The cubic root of 72581149 is about 417.1330616048.

The spelling of 72581149 in words is "seventy-two million, five hundred eighty-one thousand, one hundred forty-nine".