9561977 has 4 divisors (see below), whose sum is σ = 9569700. Its totient is φ = 9554256.

The previous prime is 9561961. The next prime is 9561983. The reversal of 9561977 is 7791659.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7791659 = 1283 ⋅6073.

It can be written as a sum of positive squares in 2 ways, for example, as 1157776 + 8404201 = 1076^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 9561977 - 2⁴ = 9561961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9591977) 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, 1538 + ... + 4635.

It is an arithmetic number, because the mean of its divisors is an integer number (2392425).

Almost surely, 2^9561977 is an apocalyptic number.

It is an amenable number.

9561977 is a deficient number, since it is larger than the sum of its proper divisors (7723).

9561977 is a wasteful number, since it uses less digits than its factorization.

9561977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7722.

The product of its digits is 119070, while the sum is 44.

The square root of 9561977 is about 3092.2446539690. The cubic root of 9561977 is about 212.2507490483.

The spelling of 9561977 in words is "nine million, five hundred sixty-one thousand, nine hundred seventy-seven".