7217861849 has 8 divisors (see below), whose sum is σ = 7899353280. Its totient is φ = 6540590800.

The previous prime is 7217861803. The next prime is 7217861927. The reversal of 7217861849 is 9481687127.

It is a happy number.

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 7217861849 - 2¹² = 7217857753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7217861849.

It is not an unprimeable number, because it can be changed into a prime (7217861249) 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, 1051514 + ... + 1058355.

It is an arithmetic number, because the mean of its divisors is an integer number (987419160).

Almost surely, 2^7217861849 is an apocalyptic number.

It is an amenable number.

7217861849 is a deficient number, since it is larger than the sum of its proper divisors (681491431).

7217861849 is a wasteful number, since it uses less digits than its factorization.

7217861849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110191.

The product of its digits is 1354752, while the sum is 53.

The square root of 7217861849 is about 84958.0005002472. Note that the first 3 decimals coincide. The cubic root of 7217861849 is about 1932.5742492421.

The spelling of 7217861849 in words is "seven billion, two hundred seventeen million, eight hundred sixty-one thousand, eight hundred forty-nine".