1297120287 has 8 divisors (see below), whose sum is σ = 1757846320. Its totient is φ = 850570560.

The previous prime is 1297120277. The next prime is 1297120289. The reversal of 1297120287 is 7820217921.

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

It is not a de Polignac number, because 1297120287 - 2⁸ = 1297120031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297120289) 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, 3543862 + ... + 3544227.

It is an arithmetic number, because the mean of its divisors is an integer number (219730790).

Almost surely, 2^1297120287 is an apocalyptic number.

1297120287 is a deficient number, since it is larger than the sum of its proper divisors (460726033).

1297120287 is an equidigital number, since it uses as much as digits as its factorization.

1297120287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088153.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 1297120287 is about 36015.5561806284. The cubic root of 1297120287 is about 1090.5864159299.

The spelling of 1297120287 in words is "one billion, two hundred ninety-seven million, one hundred twenty thousand, two hundred eighty-seven".