9957491 has 4 divisors (see below), whose sum is σ = 9966984. Its totient is φ = 9948000.

The previous prime is 9957487. The next prime is 9957511. The reversal of 9957491 is 1947599.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1947599 = 43 ⋅45293.

It is a cyclic number.

It is not a de Polignac number, because 9957491 - 2² = 9957487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9957401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 5346.

It is an arithmetic number, because the mean of its divisors is an integer number (2491746).

Almost surely, 2^9957491 is an apocalyptic number.

9957491 is a deficient number, since it is larger than the sum of its proper divisors (9493).

9957491 is a wasteful number, since it uses less digits than its factorization.

9957491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492.

The product of its digits is 102060, while the sum is 44.

The square root of 9957491 is about 3155.5492390391. The cubic root of 9957491 is about 215.1377591984.

The spelling of 9957491 in words is "nine million, nine hundred fifty-seven thousand, four hundred ninety-one".