1297400851 has 2 divisors, whose sum is σ = 1297400852. Its totient is φ = 1297400850.

The previous prime is 1297400803. The next prime is 1297400857. The reversal of 1297400851 is 1580047921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297400851 - 2¹⁹ = 1296876563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297400851.

It is not a weakly prime, because it can be changed into another prime (1297400857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648700425 + 648700426.

It is an arithmetic number, because the mean of its divisors is an integer number (648700426).

Almost surely, 2^1297400851 is an apocalyptic number.

1297400851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297400851 is an equidigital number, since it uses as much as digits as its factorization.

1297400851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1297400851 is about 36019.4510091423. The cubic root of 1297400851 is about 1090.6650406681.

The spelling of 1297400851 in words is "one billion, two hundred ninety-seven million, four hundred thousand, eight hundred fifty-one".