1281001670 has 32 divisors (see below), whose sum is σ = 2484790560. Its totient is φ = 472677120.

The previous prime is 1281001651. The next prime is 1281001693. The reversal of 1281001670 is 761001821.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328130 + ... + 332010.

It is an arithmetic number, because the mean of its divisors is an integer number (77649705).

Almost surely, 2^1281001670 is an apocalyptic number.

1281001670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281001670 is a deficient number, since it is larger than the sum of its proper divisors (1203788890).

1281001670 is a wasteful number, since it uses less digits than its factorization.

1281001670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1281001670 is about 35791.0836661870. The cubic root of 1281001670 is about 1086.0501968213.

The spelling of 1281001670 in words is "one billion, two hundred eighty-one million, one thousand, six hundred seventy".