1215738431 has 2 divisors, whose sum is σ = 1215738432. Its totient is φ = 1215738430.

The previous prime is 1215738421. The next prime is 1215738451. The reversal of 1215738431 is 1348375121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1348375121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215738431 is a prime.

It is a super-2 number, since 2×1215738431² = 2956039865220683522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215738391 and 1215738400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215738401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607869215 + 607869216.

It is an arithmetic number, because the mean of its divisors is an integer number (607869216).

Almost surely, 2^1215738431 is an apocalyptic number.

1215738431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215738431 is an equidigital number, since it uses as much as digits as its factorization.

1215738431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 1215738431 is about 34867.4408438589. The cubic root of 1215738431 is about 1067.2841220762.

The spelling of 1215738431 in words is "one billion, two hundred fifteen million, seven hundred thirty-eight thousand, four hundred thirty-one".