1205134651 has 16 divisors (see below), whose sum is σ = 1396695040. Its totient is φ = 1018461600.

The previous prime is 1205134633. The next prime is 1205134663. The reversal of 1205134651 is 1564315021.

It is a cyclic number.

It is not a de Polignac number, because 1205134651 - 2¹³ = 1205126459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205134621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616726 + ... + 618676.

It is an arithmetic number, because the mean of its divisors is an integer number (87293440).

Almost surely, 2^1205134651 is an apocalyptic number.

1205134651 is a deficient number, since it is larger than the sum of its proper divisors (191560389).

1205134651 is a wasteful number, since it uses less digits than its factorization.

1205134651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1205134651 is about 34715.0493446286. The cubic root of 1205134651 is about 1064.1720738882.

Adding to 1205134651 its reverse (1564315021), we get a palindrome (2769449672).

The spelling of 1205134651 in words is "one billion, two hundred five million, one hundred thirty-four thousand, six hundred fifty-one".