1271823641 has 4 divisors (see below), whose sum is σ = 1387443984. Its totient is φ = 1156203300.

The previous prime is 1271823629. The next prime is 1271823659. The reversal of 1271823641 is 1463281721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1271823641 - 2¹⁸ = 1271561497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271823611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57810155 + ... + 57810176.

It is an arithmetic number, because the mean of its divisors is an integer number (346860996).

Almost surely, 2^1271823641 is an apocalyptic number.

1271823641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1271823641 is a deficient number, since it is larger than the sum of its proper divisors (115620343).

1271823641 is a wasteful number, since it uses less digits than its factorization.

1271823641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115620342.

The product of its digits is 16128, while the sum is 35.

The square root of 1271823641 is about 35662.6364841412. The cubic root of 1271823641 is about 1083.4502259876.

The spelling of 1271823641 in words is "one billion, two hundred seventy-one million, eight hundred twenty-three thousand, six hundred forty-one".