1209275136423 has 24 divisors (see below), whose sum is σ = 1769759342208. Its totient is φ = 795612144912.

The previous prime is 1209275136379. The next prime is 1209275136457. The reversal of 1209275136423 is 3246315729021.

It is a happy number.

1209275136423 is a `hidden beast` number, since 1 + 2 + 0 + 92 + 7 + 5 + 136 + 423 = 666.

It is not a de Polignac number, because 1209275136423 - 2⁶ = 1209275136359 is a prime.

It is a super-2 number, since 2×1209275136423² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209275186423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2134065 + ... + 2640602.

It is an arithmetic number, because the mean of its divisors is an integer number (73739972592).

Almost surely, 2^{1209275136423} is an apocalyptic number.

1209275136423 is a deficient number, since it is larger than the sum of its proper divisors (560484205785).

1209275136423 is a wasteful number, since it uses less digits than its factorization.

1209275136423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4775043 (or 4775040 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 1209275136423 in words is "one trillion, two hundred nine billion, two hundred seventy-five million, one hundred thirty-six thousand, four hundred twenty-three".