9940879451 has 4 divisors (see below), whose sum is σ = 9950993232. Its totient is φ = 9930765672.

The previous prime is 9940879447. The next prime is 9940879469. The reversal of 9940879451 is 1549780499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1549780499 = 14813 ⋅104623.

It is a cyclic number.

It is not a de Polignac number, because 9940879451 - 2² = 9940879447 is a prime.

It is a super-2 number, since 2×9940879451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9940879411) 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, 5055416 + ... + 5057381.

It is an arithmetic number, because the mean of its divisors is an integer number (2487748308).

Almost surely, 2^9940879451 is an apocalyptic number.

9940879451 is a deficient number, since it is larger than the sum of its proper divisors (10113781).

9940879451 is a wasteful number, since it uses less digits than its factorization.

9940879451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10113780.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The square root of 9940879451 is about 99703.9590537908. The cubic root of 9940879451 is about 2150.1805834258.

The spelling of 9940879451 in words is "nine billion, nine hundred forty million, eight hundred seventy-nine thousand, four hundred fifty-one".