1299657001 has 2 divisors, whose sum is σ = 1299657002. Its totient is φ = 1299657000.

The previous prime is 1299656999. The next prime is 1299657041. The reversal of 1299657001 is 1007569921.

It is an a-pointer prime, because the next prime (1299657041) can be obtained adding 1299657001 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1069224601 + 230432400 = 32699^2 + 15180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299657001 - 2¹ = 1299656999 is a prime.

Together with 1299656999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1299657041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649828500 + 649828501.

It is an arithmetic number, because the mean of its divisors is an integer number (649828501).

Almost surely, 2^1299657001 is an apocalyptic number.

1299657001 is the 22801-st centered pentagonal number.

It is an amenable number.

1299657001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299657001 is an equidigital number, since it uses as much as digits as its factorization.

1299657001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 1299657001 is about 36050.7559005356. The cubic root of 1299657001 is about 1091.2968882930.

The spelling of 1299657001 in words is "one billion, two hundred ninety-nine million, six hundred fifty-seven thousand, one".