1257141487 has 4 divisors (see below), whose sum is σ = 1436733136. Its totient is φ = 1077549840.

The previous prime is 1257141463. The next prime is 1257141493. The reversal of 1257141487 is 7841417521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257141487 - 2⁷ = 1257141359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257141427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89795814 + ... + 89795827.

It is an arithmetic number, because the mean of its divisors is an integer number (359183284).

Almost surely, 2^1257141487 is an apocalyptic number.

1257141487 is a deficient number, since it is larger than the sum of its proper divisors (179591649).

1257141487 is an equidigital number, since it uses as much as digits as its factorization.

1257141487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179591648.

The product of its digits is 62720, while the sum is 40.

The square root of 1257141487 is about 35456.1910954913. The cubic root of 1257141487 is about 1079.2648995742.

The spelling of 1257141487 in words is "one billion, two hundred fifty-seven million, one hundred forty-one thousand, four hundred eighty-seven".