1851001649 has 8 divisors (see below), whose sum is σ = 2136376128. Its totient is φ = 1570863600.

The previous prime is 1851001609. The next prime is 1851001699. The reversal of 1851001649 is 9461001581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1851001649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1851001609) 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, 1308347 + ... + 1309760.

It is an arithmetic number, because the mean of its divisors is an integer number (267047016).

Almost surely, 2^1851001649 is an apocalyptic number.

It is an amenable number.

1851001649 is a deficient number, since it is larger than the sum of its proper divisors (285374479).

1851001649 is a wasteful number, since it uses less digits than its factorization.

1851001649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618215.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 1851001649 is about 43023.2686926505. The cubic root of 1851001649 is about 1227.8225403341.

The spelling of 1851001649 in words is "one billion, eight hundred fifty-one million, one thousand, six hundred forty-nine".