7191641057 has 4 divisors (see below), whose sum is σ = 7214617860. Its totient is φ = 7168664256.

The previous prime is 7191640993. The next prime is 7191641069. The reversal of 7191641057 is 7501461917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3710759056 + 3480882001 = 60916^2 + 58999^2 .

It is a cyclic number.

It is not a de Polignac number, because 7191641057 - 2⁶ = 7191640993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7191641657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11487932 + ... + 11488557.

It is an arithmetic number, because the mean of its divisors is an integer number (1803654465).

Almost surely, 2^7191641057 is an apocalyptic number.

It is an amenable number.

7191641057 is a deficient number, since it is larger than the sum of its proper divisors (22976803).

7191641057 is a wasteful number, since it uses less digits than its factorization.

7191641057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22976802.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 7191641057 is about 84803.5438941086. The cubic root of 7191641057 is about 1930.2312140330.

The spelling of 7191641057 in words is "seven billion, one hundred ninety-one million, six hundred forty-one thousand, fifty-seven".