1261406273 has 16 divisors (see below), whose sum is σ = 1399337856. Its totient is φ = 1130976000.

The previous prime is 1261406269. The next prime is 1261406299. The reversal of 1261406273 is 3726041621.

It is not a de Polignac number, because 1261406273 - 2² = 1261406269 is a prime.

It is a super-2 number, since 2×1261406273² = 3182291571127501058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261406203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91715 + ... + 104567.

It is an arithmetic number, because the mean of its divisors is an integer number (87458616).

Almost surely, 2^1261406273 is an apocalyptic number.

It is an amenable number.

1261406273 is a deficient number, since it is larger than the sum of its proper divisors (137931583).

1261406273 is a wasteful number, since it uses less digits than its factorization.

1261406273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13144.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 1261406273 is about 35516.2818014499. The cubic root of 1261406273 is about 1080.4839717609.

Adding to 1261406273 its reverse (3726041621), we get a palindrome (4987447894).

The spelling of 1261406273 in words is "one billion, two hundred sixty-one million, four hundred six thousand, two hundred seventy-three".