1257169491 has 12 divisors (see below), whose sum is σ = 1883167832. Its totient is φ = 838112832.

The previous prime is 1257169481. The next prime is 1257169531. The reversal of 1257169491 is 1949617521.

1257169491 is a `hidden beast` number, since 12 + 571 + 69 + 4 + 9 + 1 = 666.

It is not a de Polignac number, because 1257169491 - 2¹⁰ = 1257168467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257169421) 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 in 11 ways as a sum of consecutive naturals, for example, 2586526 + ... + 2587011.

Almost surely, 2^1257169491 is an apocalyptic number.

1257169491 is a deficient number, since it is larger than the sum of its proper divisors (625998341).

1257169491 is an frugal number, since it uses more digits than its factorization.

1257169491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173552 (or 5173540 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1257169491 is about 35456.5860031673. The cubic root of 1257169491 is about 1079.2729133923.

The spelling of 1257169491 in words is "one billion, two hundred fifty-seven million, one hundred sixty-nine thousand, four hundred ninety-one".