1261871030 has 24 divisors (see below), whose sum is σ = 2642204448. Its totient is φ = 432641328.

The previous prime is 1261870933. The next prime is 1261871033. The reversal of 1261871030 is 301781621.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1261870984 and 1261871002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261871033) 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 11 ways as a sum of consecutive naturals, for example, 1287134 + ... + 1288113.

It is an arithmetic number, because the mean of its divisors is an integer number (110091852).

Almost surely, 2^1261871030 is an apocalyptic number.

1261871030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261871030 is an abundant number, since it is smaller than the sum of its proper divisors (1380333418).

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

1261871030 is a wasteful number, since it uses less digits than its factorization.

1261871030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575268 (or 2575261 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1261871030 is about 35522.8240712925. The cubic root of 1261871030 is about 1080.6166545821.

The spelling of 1261871030 in words is "one billion, two hundred sixty-one million, eight hundred seventy-one thousand, thirty".