1247859249 has 32 divisors (see below), whose sum is σ = 2081366784. Its totient is φ = 647412480.

The previous prime is 1247859247. The next prime is 1247859251. The reversal of 1247859249 is 9429587421.

It is an interprime number because it is at equal distance from previous prime (1247859247) and next prime (1247859251).

It is not a de Polignac number, because 1247859249 - 2¹ = 1247859247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1247859247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20814 + ... + 54119.

It is an arithmetic number, because the mean of its divisors is an integer number (65042712).

Almost surely, 2^1247859249 is an apocalyptic number.

It is an amenable number.

1247859249 is a deficient number, since it is larger than the sum of its proper divisors (833507535).

1247859249 is a wasteful number, since it uses less digits than its factorization.

1247859249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75017.

The product of its digits is 1451520, while the sum is 51.

The square root of 1247859249 is about 35325.0512950795. The cubic root of 1247859249 is about 1076.6020458659.

The spelling of 1247859249 in words is "one billion, two hundred forty-seven million, eight hundred fifty-nine thousand, two hundred forty-nine".