977201221 has 4 divisors (see below), whose sum is σ = 988181100. Its totient is φ = 966221344.

The previous prime is 977201219. The next prime is 977201243. The reversal of 977201221 is 122102779.

It is a happy number.

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 506745121 + 470456100 = 22511^2 + 21690^2 .

It is a cyclic number.

It is not a de Polignac number, because 977201221 - 2¹ = 977201219 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 (977201261) 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, 5489806 + ... + 5489983.

It is an arithmetic number, because the mean of its divisors is an integer number (247045275).

Almost surely, 2^977201221 is an apocalyptic number.

It is an amenable number.

977201221 is a deficient number, since it is larger than the sum of its proper divisors (10979879).

977201221 is a wasteful number, since it uses less digits than its factorization.

977201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10979878.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 977201221 is about 31260.2178655236. The cubic root of 977201221 is about 992.3419103695.

The spelling of 977201221 in words is "nine hundred seventy-seven million, two hundred one thousand, two hundred twenty-one".