147813581 has 2 divisors, whose sum is σ = 147813582. Its totient is φ = 147813580.

The previous prime is 147813577. The next prime is 147813593. The reversal of 147813581 is 185318741.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145684900 + 2128681 = 12070^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 147813581 - 2² = 147813577 is a prime.

It is a super-2 number, since 2×147813581² = 43697709456087122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147813511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73906790 + 73906791.

It is an arithmetic number, because the mean of its divisors is an integer number (73906791).

Almost surely, 2^147813581 is an apocalyptic number.

It is an amenable number.

147813581 is a deficient number, since it is larger than the sum of its proper divisors (1).

147813581 is an equidigital number, since it uses as much as digits as its factorization.

147813581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 147813581 is about 12157.8608727029. The cubic root of 147813581 is about 528.7350645853.

The spelling of 147813581 in words is "one hundred forty-seven million, eight hundred thirteen thousand, five hundred eighty-one".