1257131087 has 2 divisors, whose sum is σ = 1257131088. Its totient is φ = 1257131086.

The previous prime is 1257131059. The next prime is 1257131093. The reversal of 1257131087 is 7801317521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257131087 - 2¹² = 1257126991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257131017) 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, 628565543 + 628565544.

It is an arithmetic number, because the mean of its divisors is an integer number (628565544).

Almost surely, 2^1257131087 is an apocalyptic number.

1257131087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257131087 is an equidigital number, since it uses as much as digits as its factorization.

1257131087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 1257131087 is about 35456.0444353287. The cubic root of 1257131087 is about 1079.2619234080.

The spelling of 1257131087 in words is "one billion, two hundred fifty-seven million, one hundred thirty-one thousand, eighty-seven".