1257221711 has 2 divisors, whose sum is σ = 1257221712. Its totient is φ = 1257221710.

The previous prime is 1257221681. The next prime is 1257221741. The reversal of 1257221711 is 1171227521.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1257221681) and next prime (1257221741).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257221711 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257221741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628610855 + 628610856.

It is an arithmetic number, because the mean of its divisors is an integer number (628610856).

Almost surely, 2^1257221711 is an apocalyptic number.

1257221711 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257221711 is an equidigital number, since it uses as much as digits as its factorization.

1257221711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 29.

The square root of 1257221711 is about 35457.3223890355. The cubic root of 1257221711 is about 1079.2878567105.

The spelling of 1257221711 in words is "one billion, two hundred fifty-seven million, two hundred twenty-one thousand, seven hundred eleven".