30771989 has 8 divisors (see below), whose sum is σ = 32919768. Its totient is φ = 28661760.

The previous prime is 30771943. The next prime is 30771997. The reversal of 30771989 is 98917703.

It can be written as a sum of positive squares in 4 ways, for example, as 2235025 + 28536964 = 1495^2 + 5342^2 .

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 30771989 - 2⁸ = 30771733 is a prime.

It is a super-2 number, since 2×30771989² = 1893830614032242, 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 (30771889) 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, 7682 + ... + 10979.

It is an arithmetic number, because the mean of its divisors is an integer number (4114971).

Almost surely, 2^30771989 is an apocalyptic number.

It is an amenable number.

30771989 is a deficient number, since it is larger than the sum of its proper divisors (2147779).

30771989 is a wasteful number, since it uses less digits than its factorization.

30771989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18775.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 30771989 is about 5547.2505802424. The cubic root of 30771989 is about 313.3659871155.

The spelling of 30771989 in words is "thirty million, seven hundred seventy-one thousand, nine hundred eighty-nine".