1281171551 has 8 divisors (see below), whose sum is σ = 1398281808. Its totient is φ = 1164168000.

The previous prime is 1281171547. The next prime is 1281171559. The reversal of 1281171551 is 1551711821.

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 1281171551 - 2² = 1281171547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281171559) 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, 440 + ... + 50621.

It is an arithmetic number, because the mean of its divisors is an integer number (174785226).

Almost surely, 2^1281171551 is an apocalyptic number.

1281171551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1281171551 is a deficient number, since it is larger than the sum of its proper divisors (117110257).

1281171551 is a wasteful number, since it uses less digits than its factorization.

1281171551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53353.

The product of its digits is 2800, while the sum is 32.

The square root of 1281171551 is about 35793.4568182510. The cubic root of 1281171551 is about 1086.0982038204.

The spelling of 1281171551 in words is "one billion, two hundred eighty-one million, one hundred seventy-one thousand, five hundred fifty-one".