1305216431 has 2 divisors, whose sum is σ = 1305216432. Its totient is φ = 1305216430.

The previous prime is 1305216401. The next prime is 1305216449. The reversal of 1305216431 is 1346125031.

It is a strong prime.

It is an emirp because it is prime and its reverse (1346125031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1305216431 - 2¹⁴ = 1305200047 is a prime.

It is a super-2 number, since 2×1305216431² = 3407179863504755522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1305216431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305216401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652608215 + 652608216.

It is an arithmetic number, because the mean of its divisors is an integer number (652608216).

Almost surely, 2^1305216431 is an apocalyptic number.

1305216431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305216431 is an equidigital number, since it uses as much as digits as its factorization.

1305216431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1305216431 is about 36127.7792148922. The cubic root of 1305216431 is about 1092.8507235000.

The spelling of 1305216431 in words is "one billion, three hundred five million, two hundred sixteen thousand, four hundred thirty-one".