30677981 has 4 divisors (see below), whose sum is σ = 31330752. Its totient is φ = 30025212.

The previous prime is 30677971. The next prime is 30678001. The reversal of 30677981 is 18977603.

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 30677981 - 2¹⁸ = 30415837 is a prime.

It is a super-2 number, since 2×30677981² = 1882277036472722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30677971) 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, 326315 + ... + 326408.

It is an arithmetic number, because the mean of its divisors is an integer number (7832688).

Almost surely, 2^30677981 is an apocalyptic number.

It is an amenable number.

30677981 is a deficient number, since it is larger than the sum of its proper divisors (652771).

30677981 is an equidigital number, since it uses as much as digits as its factorization.

30677981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652770.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 30677981 is about 5538.7707119902. The cubic root of 30677981 is about 313.0465520216.

It can be divided in two parts, 306 and 77981, that added together give a palindrome (78287).

The spelling of 30677981 in words is "thirty million, six hundred seventy-seven thousand, nine hundred eighty-one".