1618337021 has 4 divisors (see below), whose sum is σ = 1849528032. Its totient is φ = 1387146012.

The previous prime is 1618336991. The next prime is 1618337029. The reversal of 1618337021 is 1207338161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1207338161 = 557 ⋅2167573.

It is not a de Polignac number, because 1618337021 - 2²⁶ = 1551228157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618337029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115595495 + ... + 115595508.

It is an arithmetic number, because the mean of its divisors is an integer number (462382008).

Almost surely, 2^1618337021 is an apocalyptic number.

It is an amenable number.

1618337021 is a deficient number, since it is larger than the sum of its proper divisors (231191011).

1618337021 is an equidigital number, since it uses as much as digits as its factorization.

1618337021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231191010.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1618337021 is about 40228.5597679062. The cubic root of 1618337021 is about 1174.0582817560.

The spelling of 1618337021 in words is "one billion, six hundred eighteen million, three hundred thirty-seven thousand, twenty-one".