618153449 has 2 divisors, whose sum is σ = 618153450. Its totient is φ = 618153448.

The previous prime is 618153421. The next prime is 618153463. The reversal of 618153449 is 944351816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616628224 + 1525225 = 24832^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618153449 is a prime.

It is a super-2 number, since 2×618153449² = 764227373021191202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (618153649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309076724 + 309076725.

It is an arithmetic number, because the mean of its divisors is an integer number (309076725).

Almost surely, 2^618153449 is an apocalyptic number.

It is an amenable number.

618153449 is a deficient number, since it is larger than the sum of its proper divisors (1).

618153449 is an equidigital number, since it uses as much as digits as its factorization.

618153449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 618153449 is about 24862.6919097671. The cubic root of 618153449 is about 851.8545202060.

The spelling of 618153449 in words is "six hundred eighteen million, one hundred fifty-three thousand, four hundred forty-nine".