9911957 has 10 divisors (see below), whose sum is σ = 10919190. Its totient is φ = 8997560.

The previous prime is 9911953. The next prime is 9911959. The reversal of 9911957 is 7591199.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9897316 + 14641 = 3146^2 + 121^2 .

It is not a de Polignac number, because 9911957 - 2² = 9911953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911953) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14303 + ... + 14979.

It is an arithmetic number, because the mean of its divisors is an integer number (1091919).

Almost surely, 2^9911957 is an apocalyptic number.

It is an amenable number.

9911957 is a deficient number, since it is larger than the sum of its proper divisors (1007233).

9911957 is an frugal number, since it uses more digits than its factorization.

9911957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 688 counting only the distinct ones).

The product of its digits is 25515, while the sum is 41.

The square root of 9911957 is about 3148.3260631644. The cubic root of 9911957 is about 214.8093279786.

The spelling of 9911957 in words is "nine million, nine hundred eleven thousand, nine hundred fifty-seven".