1518368381 has 2 divisors, whose sum is σ = 1518368382. Its totient is φ = 1518368380.

The previous prime is 1518368353. The next prime is 1518368407. The reversal of 1518368381 is 1838638151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1271564281 + 246804100 = 35659^2 + 15710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1518368381 - 2⁶ = 1518368317 is a prime.

It is a super-2 number, since 2×1518368381² = 4610885080841122322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1518367381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 759184190 + 759184191.

It is an arithmetic number, because the mean of its divisors is an integer number (759184191).

Almost surely, 2^1518368381 is an apocalyptic number.

It is an amenable number.

1518368381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1518368381 is an equidigital number, since it uses as much as digits as its factorization.

1518368381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 44.

The square root of 1518368381 is about 38966.2466886407. The cubic root of 1518368381 is about 1149.3678645618.

The spelling of 1518368381 in words is "one billion, five hundred eighteen million, three hundred sixty-eight thousand, three hundred eighty-one".