1281172867 has 12 divisors (see below), whose sum is σ = 1425031104. Its totient is φ = 1143830160.

The previous prime is 1281172847. The next prime is 1281172877. The reversal of 1281172867 is 7682711821.

It is a de Polignac number, because none of the positive numbers 2^k-1281172867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281172807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 717658 + ... + 719440.

It is an arithmetic number, because the mean of its divisors is an integer number (118752592).

Almost surely, 2^1281172867 is an apocalyptic number.

1281172867 is a deficient number, since it is larger than the sum of its proper divisors (143858237).

1281172867 is an frugal number, since it uses more digits than its factorization.

1281172867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610 (or 1827 counting only the distinct ones).

The product of its digits is 75264, while the sum is 43.

The square root of 1281172867 is about 35793.4752014945. The cubic root of 1281172867 is about 1086.0985756948.

The spelling of 1281172867 in words is "one billion, two hundred eighty-one million, one hundred seventy-two thousand, eight hundred sixty-seven".