9964551 has 4 divisors (see below), whose sum is σ = 13286072. Its totient is φ = 6643032.

The previous prime is 9964501. The next prime is 9964561. The reversal of 9964551 is 1554699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1554699 = 3 ⋅518233.

It is not a de Polignac number, because 9964551 - 2¹⁵ = 9931783 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 (9964501) 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, 1660756 + ... + 1660761.

It is an arithmetic number, because the mean of its divisors is an integer number (3321518).

Almost surely, 2^9964551 is an apocalyptic number.

9964551 is a deficient number, since it is larger than the sum of its proper divisors (3321521).

9964551 is a wasteful number, since it uses less digits than its factorization.

9964551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321520.

The product of its digits is 48600, while the sum is 39.

The square root of 9964551 is about 3156.6677050333. The cubic root of 9964551 is about 215.1885924104.

The spelling of 9964551 in words is "nine million, nine hundred sixty-four thousand, five hundred fifty-one".