9551379691 has 4 divisors (see below), whose sum is σ = 10915862512. Its totient is φ = 8186896872.

The previous prime is 9551379647. The next prime is 9551379751. The reversal of 9551379691 is 1969731559.

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

It is not a de Polignac number, because 9551379691 - 2⁹ = 9551379179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9551379191) 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, 682241400 + ... + 682241413.

It is an arithmetic number, because the mean of its divisors is an integer number (2728965628).

Almost surely, 2^9551379691 is an apocalyptic number.

9551379691 is a deficient number, since it is larger than the sum of its proper divisors (1364482821).

9551379691 is a wasteful number, since it uses less digits than its factorization.

9551379691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364482820.

The product of its digits is 2296350, while the sum is 55.

The square root of 9551379691 is about 97731.1602867785. The cubic root of 9551379691 is about 2121.7230926440.

The spelling of 9551379691 in words is "nine billion, five hundred fifty-one million, three hundred seventy-nine thousand, six hundred ninety-one".