8661949 has 4 divisors (see below), whose sum is σ = 8825436. Its totient is φ = 8498464.

The previous prime is 8661943. The next prime is 8661953. The reversal of 8661949 is 9491668.

8661949 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 can be written as a sum of positive squares in 2 ways, for example, as 7601049 + 1060900 = 2757^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661949 - 2³ = 8661941 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 (8661941) 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, 81664 + ... + 81769.

It is an arithmetic number, because the mean of its divisors is an integer number (2206359).

Almost surely, 2^8661949 is an apocalyptic number.

It is an amenable number.

8661949 is a deficient number, since it is larger than the sum of its proper divisors (163487).

8661949 is a wasteful number, since it uses less digits than its factorization.

8661949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163486.

The product of its digits is 93312, while the sum is 43.

The square root of 8661949 is about 2943.1189238629. The cubic root of 8661949 is about 205.3707271410.

It can be divided in two parts, 86619 and 49, that added together give a palindrome (86668).

The spelling of 8661949 in words is "eight million, six hundred sixty-one thousand, nine hundred forty-nine".