7351721861 has 8 divisors (see below), whose sum is σ = 8020684800. Its totient is φ = 6682863040.

The previous prime is 7351721843. The next prime is 7351721869. The reversal of 7351721861 is 1681271537.

It is a happy number.

7351721861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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-7351721861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7351721869) 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, 238925 + ... + 267933.

It is an arithmetic number, because the mean of its divisors is an integer number (1002585600).

Almost surely, 2^7351721861 is an apocalyptic number.

It is an amenable number.

7351721861 is a deficient number, since it is larger than the sum of its proper divisors (668962939).

7351721861 is a wasteful number, since it uses less digits than its factorization.

7351721861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52059.

The product of its digits is 70560, while the sum is 41.

The square root of 7351721861 is about 85742.1825066286. The cubic root of 7351721861 is about 1944.4481011776.

The spelling of 7351721861 in words is "seven billion, three hundred fifty-one million, seven hundred twenty-one thousand, eight hundred sixty-one".