30903989 has 2 divisors, whose sum is σ = 30903990. Its totient is φ = 30903988.

The previous prime is 30903959. The next prime is 30904001. The reversal of 30903989 is 98930903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30195025 + 708964 = 5495^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 30903989 - 2¹⁶ = 30838453 is a prime.

It is a super-2 number, since 2×30903989² = 1910113072224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30903919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15451994 + 15451995.

It is an arithmetic number, because the mean of its divisors is an integer number (15451995).

Almost surely, 2^30903989 is an apocalyptic number.

It is an amenable number.

30903989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30903989 is an equidigital number, since it uses as much as digits as its factorization.

30903989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 30903989 is about 5559.1356342511. The cubic root of 30903989 is about 313.8134211459.

The spelling of 30903989 in words is "thirty million, nine hundred three thousand, nine hundred eighty-nine".