9951257279 has 4 divisors (see below), whose sum is σ = 9951640320. Its totient is φ = 9950874240.

The previous prime is 9951257273. The next prime is 9951257291. The reversal of 9951257279 is 9727521599.

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 9951257279 - 2³² = 5656289983 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 (9951257273) 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, 149474 + ... + 205535.

It is an arithmetic number, because the mean of its divisors is an integer number (2487910080).

Almost surely, 2^9951257279 is an apocalyptic number.

9951257279 is a deficient number, since it is larger than the sum of its proper divisors (383041).

9951257279 is a wasteful number, since it uses less digits than its factorization.

9951257279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383040.

The product of its digits is 3572100, while the sum is 56.

The square root of 9951257279 is about 99755.9886873966. The cubic root of 9951257279 is about 2150.9285535917.

The spelling of 9951257279 in words is "nine billion, nine hundred fifty-one million, two hundred fifty-seven thousand, two hundred seventy-nine".