30998881 has 2 divisors, whose sum is σ = 30998882. Its totient is φ = 30998880.

The previous prime is 30998879. The next prime is 30998909. The reversal of 30998881 is 18889903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 2739025 = 5316^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 30998881 - 2¹ = 30998879 is a prime.

It is a super-2 number, since 2×30998881² = 1921861246504322, which contains 22 as substring.

Together with 30998879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30998801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15499440 + 15499441.

It is an arithmetic number, because the mean of its divisors is an integer number (15499441).

Almost surely, 2^30998881 is an apocalyptic number.

It is an amenable number.

30998881 is a deficient number, since it is larger than the sum of its proper divisors (1).

30998881 is an equidigital number, since it uses as much as digits as its factorization.

30998881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 30998881 is about 5567.6638727567. The cubic root of 30998881 is about 314.1342854034.

The spelling of 30998881 in words is "thirty million, nine hundred ninety-eight thousand, eight hundred eighty-one".