1261258122 has 16 divisors (see below), whose sum is σ = 2523342240. Its totient is φ = 420281712.

The previous prime is 1261258121. The next prime is 1261258177. The reversal of 1261258122 is 2218521621.

It is a self number, because there is not a number n which added to its sum of digits gives 1261258122.

It is not an unprimeable number, because it can be changed into a prime (1261258121) 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, 13597 + ... + 52032.

It is an arithmetic number, because the mean of its divisors is an integer number (157708890).

Almost surely, 2^1261258122 is an apocalyptic number.

1261258122 is an abundant number, since it is smaller than the sum of its proper divisors (1262084118).

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

1261258122 is a wasteful number, since it uses less digits than its factorization.

1261258122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68837.

The product of its digits is 3840, while the sum is 30.

The square root of 1261258122 is about 35514.1960629830. The cubic root of 1261258122 is about 1080.4416694904.

Adding to 1261258122 its reverse (2218521621), we get a palindrome (3479779743).

The spelling of 1261258122 in words is "one billion, two hundred sixty-one million, two hundred fifty-eight thousand, one hundred twenty-two".