1261258260 has 24 divisors (see below), whose sum is σ = 3531523296. Its totient is φ = 336335520.

The previous prime is 1261258217. The next prime is 1261258261. The reversal of 1261258260 is 628521621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261258261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10510426 + ... + 10510545.

It is an arithmetic number, because the mean of its divisors is an integer number (147146804).

Almost surely, 2^1261258260 is an apocalyptic number.

1261258260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261258260 is an abundant number, since it is smaller than the sum of its proper divisors (2270265036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261258260 is a wasteful number, since it uses less digits than its factorization.

1261258260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21020983 (or 21020981 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1261258260 is about 35514.1980058680. The cubic root of 1261258260 is about 1080.4417088957.

Adding to 1261258260 its reverse (628521621), we get a palindrome (1889779881).

The spelling of 1261258260 in words is "one billion, two hundred sixty-one million, two hundred fifty-eight thousand, two hundred sixty".