1261260278 has 8 divisors (see below), whose sum is σ = 1922905200. Its totient is φ = 620291880.

The previous prime is 1261260229. The next prime is 1261260317. The reversal of 1261260278 is 8720621621.

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

It is a Curzon number.

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, 5168978 + ... + 5169221.

It is an arithmetic number, because the mean of its divisors is an integer number (240363150).

Almost surely, 2^1261260278 is an apocalyptic number.

1261260278 is a deficient number, since it is larger than the sum of its proper divisors (661644922).

1261260278 is a wasteful number, since it uses less digits than its factorization.

1261260278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338262.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1261260278 is about 35514.2264170290. The cubic root of 1261260278 is about 1080.4422851272.

Adding to 1261260278 its reverse (8720621621), we get a palindrome (9981881899).

The spelling of 1261260278 in words is "one billion, two hundred sixty-one million, two hundred sixty thousand, two hundred seventy-eight".