1281204697 has 4 divisors (see below), whose sum is σ = 1281557376. Its totient is φ = 1280852020.

The previous prime is 1281204667. The next prime is 1281204709. The reversal of 1281204697 is 7964021821.

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 1281204697 - 2⁷ = 1281204569 is a prime.

It is a super-2 number, since 2×1281204697² = 3282970951229723618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281204667) 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, 170833 + ... + 178174.

It is an arithmetic number, because the mean of its divisors is an integer number (320389344).

Almost surely, 2^1281204697 is an apocalyptic number.

It is an amenable number.

1281204697 is a deficient number, since it is larger than the sum of its proper divisors (352679).

1281204697 is an equidigital number, since it uses as much as digits as its factorization.

1281204697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352678.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1281204697 is about 35793.9198328431. The cubic root of 1281204697 is about 1086.1075701176.

The spelling of 1281204697 in words is "one billion, two hundred eighty-one million, two hundred four thousand, six hundred ninety-seven".