1249505671 has 2 divisors, whose sum is σ = 1249505672. Its totient is φ = 1249505670.

The previous prime is 1249505591. The next prime is 1249505681. The reversal of 1249505671 is 1765059421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1765059421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1249505671 - 2²³ = 1241117063 is a prime.

It is a super-2 number, since 2×1249505671² = 3122528843722320482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249505681) 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, 624752835 + 624752836.

It is an arithmetic number, because the mean of its divisors is an integer number (624752836).

Almost surely, 2^1249505671 is an apocalyptic number.

1249505671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249505671 is an equidigital number, since it uses as much as digits as its factorization.

1249505671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 1249505671 is about 35348.3475002722. The cubic root of 1249505671 is about 1077.0753263538.

The spelling of 1249505671 in words is "one billion, two hundred forty-nine million, five hundred five thousand, six hundred seventy-one".