1618802381 has 16 divisors (see below), whose sum is σ = 1896774528. Its totient is φ = 1352635200.

The previous prime is 1618802377. The next prime is 1618802401. The reversal of 1618802381 is 1832088161.

It is not a de Polignac number, because 1618802381 - 2² = 1618802377 is a prime.

It is a super-2 number, since 2×1618802381² = 5241042297462538322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618802321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157871 + ... + 167811.

It is an arithmetic number, because the mean of its divisors is an integer number (118548408).

Almost surely, 2^1618802381 is an apocalyptic number.

It is an amenable number.

1618802381 is a deficient number, since it is larger than the sum of its proper divisors (277972147).

1618802381 is an equidigital number, since it uses as much as digits as its factorization.

1618802381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1618802381 is about 40234.3433027060. The cubic root of 1618802381 is about 1174.1708061959.

The spelling of 1618802381 in words is "one billion, six hundred eighteen million, eight hundred two thousand, three hundred eighty-one".