30147881 has 2 divisors, whose sum is σ = 30147882. Its totient is φ = 30147880.

The previous prime is 30147877. The next prime is 30147883. The reversal of 30147881 is 18874103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27206656 + 2941225 = 5216^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 30147881 - 2² = 30147877 is a prime.

It is a super-2 number, since 2×30147881² = 1817789457580322, which contains 22 as substring.

Together with 30147883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30147883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15073940 + 15073941.

It is an arithmetic number, because the mean of its divisors is an integer number (15073941).

Almost surely, 2^30147881 is an apocalyptic number.

It is an amenable number.

30147881 is a deficient number, since it is larger than the sum of its proper divisors (1).

30147881 is an equidigital number, since it uses as much as digits as its factorization.

30147881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 30147881 is about 5490.7086063640. The cubic root of 30147881 is about 311.2329702569.

The spelling of 30147881 in words is "thirty million, one hundred forty-seven thousand, eight hundred eighty-one".