1281577121 has 8 divisors (see below), whose sum is σ = 1421004288. Its totient is φ = 1145970000.

The previous prime is 1281577111. The next prime is 1281577133. The reversal of 1281577121 is 1217751821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281577121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281577111) 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, 954305 + ... + 955646.

It is an arithmetic number, because the mean of its divisors is an integer number (177625536).

Almost surely, 2^1281577121 is an apocalyptic number.

1281577121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1281577121 is a deficient number, since it is larger than the sum of its proper divisors (139427167).

1281577121 is a wasteful number, since it uses less digits than its factorization.

1281577121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910023.

The product of its digits is 7840, while the sum is 35.

The square root of 1281577121 is about 35799.1217909043. The cubic root of 1281577121 is about 1086.2127974712.

The spelling of 1281577121 in words is "one billion, two hundred eighty-one million, five hundred seventy-seven thousand, one hundred twenty-one".