1801539649 has 8 divisors (see below), whose sum is σ = 2217279680. Its totient is φ = 1425393936.

The previous prime is 1801539601. The next prime is 1801539667. The reversal of 1801539649 is 9469351081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801539649 - 2¹⁹ = 1801015361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1801539599 and 1801539608.

It is not an unprimeable number, because it can be changed into a prime (1801539049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9898479 + ... + 9898660.

It is an arithmetic number, because the mean of its divisors is an integer number (277159960).

Almost surely, 2^1801539649 is an apocalyptic number.

It is an amenable number.

1801539649 is a deficient number, since it is larger than the sum of its proper divisors (415740031).

1801539649 is a wasteful number, since it uses less digits than its factorization.

1801539649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19797159.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1801539649 is about 42444.5479302112. The cubic root of 1801539649 is about 1216.7871319848.

The spelling of 1801539649 in words is "one billion, eight hundred one million, five hundred thirty-nine thousand, six hundred forty-nine".