1281910121 has 8 divisors (see below), whose sum is σ = 1294649664. Its totient is φ = 1269226800.

The previous prime is 1281910093. The next prime is 1281910153. The reversal of 1281910121 is 1210191821.

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 1281910121 - 2¹⁸ = 1281647977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281910321) 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, 32531 + ... + 60183.

It is an arithmetic number, because the mean of its divisors is an integer number (161831208).

Almost surely, 2^1281910121 is an apocalyptic number.

It is an amenable number.

1281910121 is a deficient number, since it is larger than the sum of its proper divisors (12739543).

1281910121 is a wasteful number, since it uses less digits than its factorization.

1281910121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28111.

The product of its (nonzero) digits is 288, while the sum is 26.

The square root of 1281910121 is about 35803.7724409035. The cubic root of 1281910121 is about 1086.3068684228.

The spelling of 1281910121 in words is "one billion, two hundred eighty-one million, nine hundred ten thousand, one hundred twenty-one".