30977683921 has 2 divisors, whose sum is σ = 30977683922. Its totient is φ = 30977683920.

The previous prime is 30977683909. The next prime is 30977683967. The reversal of 30977683921 is 12938677903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30156059025 + 821624896 = 173655^2 + 28664^2 .

It is a cyclic number.

It is not a de Polignac number, because 30977683921 - 2¹¹ = 30977681873 is a prime.

It is a super-2 number, since 2×30977683921² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30977683901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15488841960 + 15488841961.

It is an arithmetic number, because the mean of its divisors is an integer number (15488841961).

Almost surely, 2^30977683921 is an apocalyptic number.

It is an amenable number.

30977683921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30977683921 is an equidigital number, since it uses as much as digits as its factorization.

30977683921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 30977683921 in words is "thirty billion, nine hundred seventy-seven million, six hundred eighty-three thousand, nine hundred twenty-one".