1297240051 has 2 divisors, whose sum is σ = 1297240052. Its totient is φ = 1297240050.

The previous prime is 1297240019. The next prime is 1297240057. The reversal of 1297240051 is 1500427921.

It is a strong prime.

It is an emirp because it is prime and its reverse (1500427921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1297240051 - 2⁵ = 1297240019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1297239995 and 1297240022.

It is not a weakly prime, because it can be changed into another prime (1297240057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648620025 + 648620026.

It is an arithmetic number, because the mean of its divisors is an integer number (648620026).

Almost surely, 2^1297240051 is an apocalyptic number.

1297240051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297240051 is an equidigital number, since it uses as much as digits as its factorization.

1297240051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1297240051 is about 36017.2188126735. The cubic root of 1297240051 is about 1090.6199797592.

Adding to 1297240051 its reverse (1500427921), we get a palindrome (2797667972).

The spelling of 1297240051 in words is "one billion, two hundred ninety-seven million, two hundred forty thousand, fifty-one".