305136431 has 2 divisors, whose sum is σ = 305136432. Its totient is φ = 305136430.

The previous prime is 305136413. The next prime is 305136439. The reversal of 305136431 is 134631503.

Together with previous prime (305136413) 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 (134631503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 305136431 - 2¹⁸ = 304874287 is a prime.

It is a super-2 number, since 2×305136431² = 186216483046835522, which contains 22 as substring.

It is equal to p_16515413 and since 305136431 and 16515413 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 305136431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305136439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152568215 + 152568216.

It is an arithmetic number, because the mean of its divisors is an integer number (152568216).

Almost surely, 2^305136431 is an apocalyptic number.

305136431 is a deficient number, since it is larger than the sum of its proper divisors (1).

305136431 is an equidigital number, since it uses as much as digits as its factorization.

305136431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 305136431 is about 17468.1547680343. The cubic root of 305136431 is about 673.2319019895.

Adding to 305136431 its reverse (134631503), we get a palindrome (439767934).

The spelling of 305136431 in words is "three hundred five million, one hundred thirty-six thousand, four hundred thirty-one".