30126731 has 2 divisors, whose sum is σ = 30126732. Its totient is φ = 30126730.

The previous prime is 30126713. The next prime is 30126743. The reversal of 30126731 is 13762103.

It is a happy number.

Together with previous prime (30126713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13762103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30126731 - 2¹⁴ = 30110347 is a prime.

It is a super-2 number, since 2×30126731² = 1815239841492722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30126697 and 30126706.

It is not a weakly prime, because it can be changed into another prime (30126781) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15063365 + 15063366.

It is an arithmetic number, because the mean of its divisors is an integer number (15063366).

Almost surely, 2^30126731 is an apocalyptic number.

30126731 is a deficient number, since it is larger than the sum of its proper divisors (1).

30126731 is an equidigital number, since it uses as much as digits as its factorization.

30126731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 30126731 is about 5488.7822875388. The cubic root of 30126731 is about 311.1601722468.

Adding to 30126731 its reverse (13762103), we get a palindrome (43888834).

The spelling of 30126731 in words is "thirty million, one hundred twenty-six thousand, seven hundred thirty-one".