30977221 has 8 divisors (see below), whose sum is σ = 33907104. Its totient is φ = 28066320.

The previous prime is 30977189. The next prime is 30977257. The reversal of 30977221 is 12277903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30977221 - 2⁵ = 30977189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30977291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1210 + ... + 7963.

It is an arithmetic number, because the mean of its divisors is an integer number (4238388).

Almost surely, 2^30977221 is an apocalyptic number.

It is an amenable number.

30977221 is a deficient number, since it is larger than the sum of its proper divisors (2929883).

30977221 is a wasteful number, since it uses less digits than its factorization.

30977221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 30977221 is about 5565.7183723218. The cubic root of 30977221 is about 314.0611028262.

The spelling of 30977221 in words is "thirty million, nine hundred seventy-seven thousand, two hundred twenty-one".