9901651 has 4 divisors (see below), whose sum is σ = 10021032. Its totient is φ = 9782272.

The previous prime is 9901649. The next prime is 9901691. The reversal of 9901651 is 1561099.

9901651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1561099 = 29 ⋅53831.

It is a cyclic number.

It is not a de Polignac number, because 9901651 - 2¹ = 9901649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9901601) 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, 59566 + ... + 59731.

It is an arithmetic number, because the mean of its divisors is an integer number (2505258).

Almost surely, 2^9901651 is an apocalyptic number.

9901651 is a deficient number, since it is larger than the sum of its proper divisors (119381).

9901651 is a wasteful number, since it uses less digits than its factorization.

9901651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119380.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 9901651 is about 3146.6888946955. The cubic root of 9901651 is about 214.7348525191.

The spelling of 9901651 in words is "nine million, nine hundred one thousand, six hundred fifty-one".