1261141918 has 8 divisors (see below), whose sum is σ = 1896868512. Its totient is φ = 628852416.

The previous prime is 1261141909. The next prime is 1261141927. The reversal of 1261141918 is 8191411621.

It is an interprime number because it is at equal distance from previous prime (1261141909) and next prime (1261141927).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858355 + ... + 859822.

It is an arithmetic number, because the mean of its divisors is an integer number (237108564).

Almost surely, 2^1261141918 is an apocalyptic number.

1261141918 is a deficient number, since it is larger than the sum of its proper divisors (635726594).

1261141918 is a wasteful number, since it uses less digits than its factorization.

1261141918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718546.

The product of its digits is 3456, while the sum is 34.

The square root of 1261141918 is about 35512.5600034692. The cubic root of 1261141918 is about 1080.4084868829.

The spelling of 1261141918 in words is "one billion, two hundred sixty-one million, one hundred forty-one thousand, nine hundred eighteen".