9151621 has 4 divisors (see below), whose sum is σ = 9217600. Its totient is φ = 9085644.

The previous prime is 9151619. The next prime is 9151633. The reversal of 9151621 is 1261519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9151621 - 2¹ = 9151619 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 (9151721) 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, 32781 + ... + 33058.

It is an arithmetic number, because the mean of its divisors is an integer number (2304400).

Almost surely, 2^9151621 is an apocalyptic number.

It is an amenable number.

9151621 is a deficient number, since it is larger than the sum of its proper divisors (65979).

9151621 is a wasteful number, since it uses less digits than its factorization.

9151621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65978.

The product of its digits is 540, while the sum is 25.

The square root of 9151621 is about 3025.1646236197. The cubic root of 9151621 is about 209.1699738282.

The spelling of 9151621 in words is "nine million, one hundred fifty-one thousand, six hundred twenty-one".