1257278587 has 2 divisors, whose sum is σ = 1257278588. Its totient is φ = 1257278586.

The previous prime is 1257278551. The next prime is 1257278597. The reversal of 1257278587 is 7858727521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257278587 - 2⁷ = 1257278459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1257278597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628639293 + 628639294.

It is an arithmetic number, because the mean of its divisors is an integer number (628639294).

Almost surely, 2^1257278587 is an apocalyptic number.

1257278587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257278587 is an equidigital number, since it uses as much as digits as its factorization.

1257278587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2195200, while the sum is 52.

The square root of 1257278587 is about 35458.1244145823. The cubic root of 1257278587 is about 1079.3041319227.

The spelling of 1257278587 in words is "one billion, two hundred fifty-seven million, two hundred seventy-eight thousand, five hundred eighty-seven".