1281357167 has 4 divisors (see below), whose sum is σ = 1356731136. Its totient is φ = 1205983200.

The previous prime is 1281357139. The next prime is 1281357173. The reversal of 1281357167 is 7617531821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281357167 - 2²⁰ = 1280308591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281357107) 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, 37686959 + ... + 37686992.

It is an arithmetic number, because the mean of its divisors is an integer number (339182784).

Almost surely, 2^1281357167 is an apocalyptic number.

1281357167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1281357167 is a deficient number, since it is larger than the sum of its proper divisors (75373969).

1281357167 is an equidigital number, since it uses as much as digits as its factorization.

1281357167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75373968.

The product of its digits is 70560, while the sum is 41.

The square root of 1281357167 is about 35796.0496004797. The cubic root of 1281357167 is about 1086.1506525522.

Adding to 1281357167 its reverse (7617531821), we get a palindrome (8898888988).

The spelling of 1281357167 in words is "one billion, two hundred eighty-one million, three hundred fifty-seven thousand, one hundred sixty-seven".