9761991 has 8 divisors (see below), whose sum is σ = 13701120. Its totient is φ = 6165432.

The previous prime is 9761987. The next prime is 9762019. The reversal of 9761991 is 1991679.

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

It is not a de Polignac number, because 9761991 - 2² = 9761987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9761291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85575 + ... + 85688.

It is an arithmetic number, because the mean of its divisors is an integer number (1712640).

Almost surely, 2^9761991 is an apocalyptic number.

9761991 is a deficient number, since it is larger than the sum of its proper divisors (3939129).

9761991 is a wasteful number, since it uses less digits than its factorization.

9761991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171285.

The product of its digits is 30618, while the sum is 42.

The square root of 9761991 is about 3124.4185058983. The cubic root of 9761991 is about 213.7204767541.

The spelling of 9761991 in words is "nine million, seven hundred sixty-one thousand, nine hundred ninety-one".