1257349811 has 2 divisors, whose sum is σ = 1257349812. Its totient is φ = 1257349810.

The previous prime is 1257349789. The next prime is 1257349823. The reversal of 1257349811 is 1189437521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257349811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1257349861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628674905 + 628674906.

It is an arithmetic number, because the mean of its divisors is an integer number (628674906).

Almost surely, 2^1257349811 is an apocalyptic number.

1257349811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257349811 is an equidigital number, since it uses as much as digits as its factorization.

1257349811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 1257349811 is about 35459.1287400015. The cubic root of 1257349811 is about 1079.3245121595.

The spelling of 1257349811 in words is "one billion, two hundred fifty-seven million, three hundred forty-nine thousand, eight hundred eleven".