7191395551 has 4 divisors (see below), whose sum is σ = 7358637352. Its totient is φ = 7024153752.

The previous prime is 7191395537. The next prime is 7191395569. The reversal of 7191395551 is 1555931917.

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

It is a cyclic number.

It is not a de Polignac number, because 7191395551 - 2⁷ = 7191395423 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 (7191395851) 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, 83620836 + ... + 83620921.

It is an arithmetic number, because the mean of its divisors is an integer number (1839659338).

Almost surely, 2^7191395551 is an apocalyptic number.

7191395551 is a deficient number, since it is larger than the sum of its proper divisors (167241801).

7191395551 is a wasteful number, since it uses less digits than its factorization.

7191395551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167241800.

The product of its digits is 212625, while the sum is 46.

The square root of 7191395551 is about 84802.0963832852. The cubic root of 7191395551 is about 1930.2092492393.

The spelling of 7191395551 in words is "seven billion, one hundred ninety-one million, three hundred ninety-five thousand, five hundred fifty-one".