1247649469 has 4 divisors (see below), whose sum is σ = 1361072160. Its totient is φ = 1134226780.

The previous prime is 1247649463. The next prime is 1247649503. The reversal of 1247649469 is 9649467421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1247649469 - 2³ = 1247649461 is a prime.

It is a super-2 number, since 2×1247649469² = 3113258394991963922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247649461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56711329 + ... + 56711350.

It is an arithmetic number, because the mean of its divisors is an integer number (340268040).

Almost surely, 2^1247649469 is an apocalyptic number.

It is an amenable number.

1247649469 is a deficient number, since it is larger than the sum of its proper divisors (113422691).

1247649469 is a wasteful number, since it uses less digits than its factorization.

1247649469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113422690.

The product of its digits is 2612736, while the sum is 52.

The square root of 1247649469 is about 35322.0818893791. The cubic root of 1247649469 is about 1076.5417126100.

The spelling of 1247649469 in words is "one billion, two hundred forty-seven million, six hundred forty-nine thousand, four hundred sixty-nine".