9961491 has 8 divisors (see below), whose sum is σ = 13981120. Its totient is φ = 6291432.

The previous prime is 9961487. The next prime is 9961517. The reversal of 9961491 is 1941699.

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

It is not a de Polignac number, because 9961491 - 2² = 9961487 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9961421) 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, 87325 + ... + 87438.

It is an arithmetic number, because the mean of its divisors is an integer number (1747640).

Almost surely, 2^9961491 is an apocalyptic number.

9961491 is a deficient number, since it is larger than the sum of its proper divisors (4019629).

9961491 is a wasteful number, since it uses less digits than its factorization.

9961491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174785.

The product of its digits is 17496, while the sum is 39.

The square root of 9961491 is about 3156.1829794865. The cubic root of 9961491 is about 215.1665628342.

The spelling of 9961491 in words is "nine million, nine hundred sixty-one thousand, four hundred ninety-one".