1245772649 has 8 divisors (see below), whose sum is σ = 1373036448. Its totient is φ = 1120844160.

The previous prime is 1245772589. The next prime is 1245772673. The reversal of 1245772649 is 9462775421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1245772649 - 2²⁰ = 1244724073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245772679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582707 + ... + 584840.

It is an arithmetic number, because the mean of its divisors is an integer number (171629556).

Almost surely, 2^1245772649 is an apocalyptic number.

It is an amenable number.

1245772649 is a deficient number, since it is larger than the sum of its proper divisors (127263799).

1245772649 is a wasteful number, since it uses less digits than its factorization.

1245772649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167655.

The product of its digits is 846720, while the sum is 47.

The square root of 1245772649 is about 35295.5046571090. The cubic root of 1245772649 is about 1076.0016333014.

It can be divided in two parts, 1245772 and 649, that added together give a palindrome (1246421).

The spelling of 1245772649 in words is "one billion, two hundred forty-five million, seven hundred seventy-two thousand, six hundred forty-nine".