1261678273 has 16 divisors (see below), whose sum is σ = 1360549440. Its totient is φ = 1165671936.

The previous prime is 1261678267. The next prime is 1261678277. The reversal of 1261678273 is 3728761621.

It is a cyclic number.

It is not a de Polignac number, because 1261678273 - 2²⁹ = 724807361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261678277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354738 + ... + 358276.

It is an arithmetic number, because the mean of its divisors is an integer number (85034340).

Almost surely, 2^1261678273 is an apocalyptic number.

It is an amenable number.

1261678273 is a deficient number, since it is larger than the sum of its proper divisors (98871167).

1261678273 is a wasteful number, since it uses less digits than its factorization.

1261678273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936.

The product of its digits is 169344, while the sum is 43.

The square root of 1261678273 is about 35520.1108247145. The cubic root of 1261678273 is about 1080.5616286124.

The spelling of 1261678273 in words is "one billion, two hundred sixty-one million, six hundred seventy-eight thousand, two hundred seventy-three".