1297787071 has 4 divisors (see below), whose sum is σ = 1483185232. Its totient is φ = 1112388912.

The previous prime is 1297787059. The next prime is 1297787081. The reversal of 1297787071 is 1707877921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1297787071 - 2²⁷ = 1163569343 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 (1297787011) 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, 92699070 + ... + 92699083.

It is an arithmetic number, because the mean of its divisors is an integer number (370796308).

Almost surely, 2^1297787071 is an apocalyptic number.

1297787071 is a deficient number, since it is larger than the sum of its proper divisors (185398161).

1297787071 is an equidigital number, since it uses as much as digits as its factorization.

1297787071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185398160.

The product of its (nonzero) digits is 345744, while the sum is 49.

The square root of 1297787071 is about 36024.8118801473. The cubic root of 1297787071 is about 1090.7732557094.

The spelling of 1297787071 in words is "one billion, two hundred ninety-seven million, seven hundred eighty-seven thousand, seventy-one".