1281970667 has 4 divisors (see below), whose sum is σ = 1282065720. Its totient is φ = 1281875616.

The previous prime is 1281970661. The next prime is 1281970687. The reversal of 1281970667 is 7660791821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1281970667 - 2¹⁴ = 1281954283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281970661) 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, 23117 + ... + 55662.

It is an arithmetic number, because the mean of its divisors is an integer number (320516430).

Almost surely, 2^1281970667 is an apocalyptic number.

1281970667 is a deficient number, since it is larger than the sum of its proper divisors (95053).

1281970667 is an equidigital number, since it uses as much as digits as its factorization.

1281970667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95052.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 1281970667 is about 35804.6179563475. The cubic root of 1281970667 is about 1086.3239706359.

The spelling of 1281970667 in words is "one billion, two hundred eighty-one million, nine hundred seventy thousand, six hundred sixty-seven".