8961551 has 4 divisors (see below), whose sum is σ = 9270600. Its totient is φ = 8652504.

The previous prime is 8961527. The next prime is 8961583. The reversal of 8961551 is 1551698.

8961551 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.

It is a cyclic number.

It is not a de Polignac number, because 8961551 - 2⁶ = 8961487 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8961751) 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, 154481 + ... + 154538.

It is an arithmetic number, because the mean of its divisors is an integer number (2317650).

Almost surely, 2^8961551 is an apocalyptic number.

8961551 is a deficient number, since it is larger than the sum of its proper divisors (309049).

8961551 is a wasteful number, since it uses less digits than its factorization.

8961551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309048.

The product of its digits is 10800, while the sum is 35.

The square root of 8961551 is about 2993.5849745748. The cubic root of 8961551 is about 207.7117478444.

The spelling of 8961551 in words is "eight million, nine hundred sixty-one thousand, five hundred fifty-one".