1257240004291 has 2 divisors, whose sum is σ = 1257240004292. Its totient is φ = 1257240004290.

The previous prime is 1257240004283. The next prime is 1257240004337. The reversal of 1257240004291 is 1924000427521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1257240004291 - 2³ = 1257240004283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1257240004291.

It is not a weakly prime, because it can be changed into another prime (1257240304291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628620002145 + 628620002146.

It is an arithmetic number, because the mean of its divisors is an integer number (628620002146).

Almost surely, 2^{1257240004291} is an apocalyptic number.

1257240004291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257240004291 is an equidigital number, since it uses as much as digits as its factorization.

1257240004291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 1257240004291 in words is "one trillion, two hundred fifty-seven billion, two hundred forty million, four thousand, two hundred ninety-one".