30125761 has 2 divisors, whose sum is σ = 30125762. Its totient is φ = 30125760.

The previous prime is 30125759. The next prime is 30125789. The reversal of 30125761 is 16752103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28826161 + 1299600 = 5369^2 + 1140^2 .

It is an emirp because it is prime and its reverse (16752103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30125761 - 2¹ = 30125759 is a prime.

It is a super-2 number, since 2×30125761² = 1815122951658242, which contains 22 as substring.

Together with 30125759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30129761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15062880 + 15062881.

It is an arithmetic number, because the mean of its divisors is an integer number (15062881).

Almost surely, 2^30125761 is an apocalyptic number.

It is an amenable number.

30125761 is a deficient number, since it is larger than the sum of its proper divisors (1).

30125761 is an equidigital number, since it uses as much as digits as its factorization.

30125761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 30125761 is about 5488.6939247876. The cubic root of 30125761 is about 311.1568327030.

Adding to 30125761 its reverse (16752103), we get a palindrome (46877864).

It can be divided in two parts, 301 and 25761, that added together give a palindrome (26062).

The spelling of 30125761 in words is "thirty million, one hundred twenty-five thousand, seven hundred sixty-one".