9951438986 has 16 divisors (see below), whose sum is σ = 15141379464. Its totient is φ = 4904400384.

The previous prime is 9951438961. The next prime is 9951438989. The reversal of 9951438986 is 6898341599.

It can be written as a sum of positive squares in 4 ways, for example, as 9182430625 + 769008361 = 95825^2 + 27731^2 .

It is a super-2 number, since 2×9951438986² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9951438989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214370 + ... + 256626.

Almost surely, 2^9951438986 is an apocalyptic number.

9951438986 is a deficient number, since it is larger than the sum of its proper divisors (5189940478).

9951438986 is a wasteful number, since it uses less digits than its factorization.

9951438986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43945.

The product of its digits is 16796160, while the sum is 62.

The square root of 9951438986 is about 99756.8994405901. The cubic root of 9951438986 is about 2150.9416452841.

The spelling of 9951438986 in words is "nine billion, nine hundred fifty-one million, four hundred thirty-eight thousand, nine hundred eighty-six".