1281668167 has 8 divisors (see below), whose sum is σ = 1383638480. Its totient is φ = 1180180800.

The previous prime is 1281668153. The next prime is 1281668173. The reversal of 1281668167 is 7618661821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281668167 - 2¹⁹ = 1281143879 is a prime.

It is a super-2 number, since 2×1281668167² = 3285346580602279778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281668117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115209 + ... + 125842.

It is an arithmetic number, because the mean of its divisors is an integer number (172954810).

Almost surely, 2^1281668167 is an apocalyptic number.

1281668167 is a deficient number, since it is larger than the sum of its proper divisors (101970313).

1281668167 is a wasteful number, since it uses less digits than its factorization.

1281668167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241473.

The product of its digits is 193536, while the sum is 46.

The square root of 1281668167 is about 35800.3933916933. The cubic root of 1281668167 is about 1086.2385191613.

The spelling of 1281668167 in words is "one billion, two hundred eighty-one million, six hundred sixty-eight thousand, one hundred sixty-seven".