1309723453 has 2 divisors, whose sum is σ = 1309723454. Its totient is φ = 1309723452.

The previous prime is 1309723451. The next prime is 1309723487. The reversal of 1309723453 is 3543279031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723986649 + 585736804 = 26907^2 + 24202^2 .

It is an emirp because it is prime and its reverse (3543279031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1309723453 - 2¹ = 1309723451 is a prime.

Together with 1309723451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309723451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654861726 + 654861727.

It is an arithmetic number, because the mean of its divisors is an integer number (654861727).

Almost surely, 2^1309723453 is an apocalyptic number.

It is an amenable number.

1309723453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309723453 is an equidigital number, since it uses as much as digits as its factorization.

1309723453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 1309723453 is about 36190.1015886941. The cubic root of 1309723453 is about 1094.1071801808.

The spelling of 1309723453 in words is "one billion, three hundred nine million, seven hundred twenty-three thousand, four hundred fifty-three".