30401681 has 2 divisors, whose sum is σ = 30401682. Its totient is φ = 30401680.

The previous prime is 30401659. The next prime is 30401687. The reversal of 30401681 is 18610403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 13104400 = 4159^2 + 3620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30401681 is a prime.

It is a super-2 number, since 2×30401681² = 1848524415251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30401687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15200840 + 15200841.

It is an arithmetic number, because the mean of its divisors is an integer number (15200841).

Almost surely, 2^30401681 is an apocalyptic number.

It is an amenable number.

30401681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30401681 is an equidigital number, since it uses as much as digits as its factorization.

30401681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 30401681 is about 5513.7719394259. The cubic root of 30401681 is about 312.1039026341.

The spelling of 30401681 in words is "thirty million, four hundred one thousand, six hundred eighty-one".