7901851849 has 4 divisors (see below), whose sum is σ = 7902271636. Its totient is φ = 7901432064.

The previous prime is 7901851823. The next prime is 7901851877. The reversal of 7901851849 is 9481581097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9481581097 = 14173 ⋅668989.

It can be written as a sum of positive squares in 2 ways, for example, as 3189990400 + 4711861449 = 56480^2 + 68643^2 .

It is a cyclic number.

It is not a de Polignac number, because 7901851849 - 2⁹ = 7901851337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7901851796 and 7901851805.

It is not an unprimeable number, because it can be changed into a prime (7901801849) 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, 180264 + ... + 219769.

It is an arithmetic number, because the mean of its divisors is an integer number (1975567909).

Almost surely, 2^7901851849 is an apocalyptic number.

It is an amenable number.

7901851849 is a deficient number, since it is larger than the sum of its proper divisors (419787).

7901851849 is a wasteful number, since it uses less digits than its factorization.

7901851849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419786.

The product of its (nonzero) digits is 725760, while the sum is 52.

The square root of 7901851849 is about 88892.3610272559. The cubic root of 7901851849 is about 1991.7873094345.

The spelling of 7901851849 in words is "seven billion, nine hundred one million, eight hundred fifty-one thousand, eight hundred forty-nine".