7291191851 has 8 divisors (see below), whose sum is σ = 7306004160. Its totient is φ = 7276396608.

The previous prime is 7291191839. The next prime is 7291191871. The reversal of 7291191851 is 1581911927.

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-7291191851 is a prime.

It is a super-2 number, since 2×7291191851² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7291191811) 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, 1136585 + ... + 1142981.

It is an arithmetic number, because the mean of its divisors is an integer number (913250520).

Almost surely, 2^7291191851 is an apocalyptic number.

7291191851 is a deficient number, since it is larger than the sum of its proper divisors (14812309).

7291191851 is a wasteful number, since it uses less digits than its factorization.

7291191851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533.

The product of its digits is 45360, while the sum is 44.

The square root of 7291191851 is about 85388.4761018722. The cubic root of 7291191851 is about 1939.0968846179.

The spelling of 7291191851 in words is "seven billion, two hundred ninety-one million, one hundred ninety-one thousand, eight hundred fifty-one".