1297740805919 has 2 divisors, whose sum is σ = 1297740805920. Its totient is φ = 1297740805918.

The previous prime is 1297740805873. The next prime is 1297740805937. The reversal of 1297740805919 is 9195080477921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297740805919 - 2¹⁶ = 1297740740383 is a prime.

It is a super-2 number, since 2×1297740805919² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297740801919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648870402959 + 648870402960.

It is an arithmetic number, because the mean of its divisors is an integer number (648870402960).

Almost surely, 2^{1297740805919} is an apocalyptic number.

1297740805919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297740805919 is an equidigital number, since it uses as much as digits as its factorization.

1297740805919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The spelling of 1297740805919 in words is "one trillion, two hundred ninety-seven billion, seven hundred forty million, eight hundred five thousand, nine hundred nineteen".