1271634479 has 2 divisors, whose sum is σ = 1271634480. Its totient is φ = 1271634478.

The previous prime is 1271634449. The next prime is 1271634499. The reversal of 1271634479 is 9744361721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271634479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271634449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635817239 + 635817240.

It is an arithmetic number, because the mean of its divisors is an integer number (635817240).

Almost surely, 2^1271634479 is an apocalyptic number.

1271634479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271634479 is an equidigital number, since it uses as much as digits as its factorization.

1271634479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 1271634479 is about 35659.9842821053. The cubic root of 1271634479 is about 1083.3965084316.

The spelling of 1271634479 in words is "one billion, two hundred seventy-one million, six hundred thirty-four thousand, four hundred seventy-nine".