9981951 has 8 divisors (see below), whose sum is σ = 15210624. Its totient is φ = 5703960.

The previous prime is 9981943. The next prime is 9982051. The reversal of 9981951 is 1591899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9981951 - 2³ = 9981943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981911) 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, 237645 + ... + 237686.

It is an arithmetic number, because the mean of its divisors is an integer number (1901328).

Almost surely, 2^9981951 is an apocalyptic number.

9981951 is a deficient number, since it is larger than the sum of its proper divisors (5228673).

9981951 is a wasteful number, since it uses less digits than its factorization.

9981951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475341.

The product of its digits is 29160, while the sum is 42.

The square root of 9981951 is about 3159.4225738258. The cubic root of 9981951 is about 215.3137729700.

The spelling of 9981951 in words is "nine million, nine hundred eighty-one thousand, nine hundred fifty-one".