147581989 has 2 divisors, whose sum is σ = 147581990. Its totient is φ = 147581988.

The previous prime is 147581969. The next prime is 147582013. The reversal of 147581989 is 989185741.

147581989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144793089 + 2788900 = 12033^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 147581989 - 2¹⁵ = 147549221 is a prime.

It is a super-2 number, since 2×147581989² = 43560886954392242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147581969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73790994 + 73790995.

It is an arithmetic number, because the mean of its divisors is an integer number (73790995).

Almost surely, 2^147581989 is an apocalyptic number.

It is an amenable number.

147581989 is a deficient number, since it is larger than the sum of its proper divisors (1).

147581989 is an equidigital number, since it uses as much as digits as its factorization.

147581989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 52.

The square root of 147581989 is about 12148.3327662688. The cubic root of 147581989 is about 528.4587823084.

The spelling of 147581989 in words is "one hundred forty-seven million, five hundred eighty-one thousand, nine hundred eighty-nine".