977544221 has 4 divisors (see below), whose sum is σ = 982177344. Its totient is φ = 972911100.

The previous prime is 977544187. The next prime is 977544223. The reversal of 977544221 is 122445779.

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 977544221 - 2⁶ = 977544157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977544223) 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, 2316245 + ... + 2316666.

It is an arithmetic number, because the mean of its divisors is an integer number (245544336).

Almost surely, 2^977544221 is an apocalyptic number.

It is an amenable number.

977544221 is a deficient number, since it is larger than the sum of its proper divisors (4633123).

977544221 is a wasteful number, since it uses less digits than its factorization.

977544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4633122.

The product of its digits is 141120, while the sum is 41.

The square root of 977544221 is about 31265.7035903560. The cubic root of 977544221 is about 992.4580015940.

The spelling of 977544221 in words is "nine hundred seventy-seven million, five hundred forty-four thousand, two hundred twenty-one".