1281797241 has 4 divisors (see below), whose sum is σ = 1709062992. Its totient is φ = 854531492.

The previous prime is 1281797239. The next prime is 1281797249. The reversal of 1281797241 is 1427971821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1281797241 - 2¹ = 1281797239 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1281797193 and 1281797202.

It is not an unprimeable number, because it can be changed into a prime (1281797249) 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, 213632871 + ... + 213632876.

It is an arithmetic number, because the mean of its divisors is an integer number (427265748).

Almost surely, 2^1281797241 is an apocalyptic number.

It is an amenable number.

1281797241 is a deficient number, since it is larger than the sum of its proper divisors (427265751).

1281797241 is an equidigital number, since it uses as much as digits as its factorization.

1281797241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427265750.

The product of its digits is 56448, while the sum is 42.

The square root of 1281797241 is about 35802.1960359976. The cubic root of 1281797241 is about 1086.2749821731.

The spelling of 1281797241 in words is "one billion, two hundred eighty-one million, seven hundred ninety-seven thousand, two hundred forty-one".