23387281109 has 2 divisors, whose sum is σ = 23387281110. Its totient is φ = 23387281108.

The previous prime is 23387281103. The next prime is 23387281117. The reversal of 23387281109 is 90118278332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19216058884 + 4171222225 = 138622^2 + 64585^2 .

It is a cyclic number.

It is not a de Polignac number, because 23387281109 - 2²⁸ = 23118845653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23387281109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23387281103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11693640554 + 11693640555.

It is an arithmetic number, because the mean of its divisors is an integer number (11693640555).

Almost surely, 2^23387281109 is an apocalyptic number.

It is an amenable number.

23387281109 is a deficient number, since it is larger than the sum of its proper divisors (1).

23387281109 is an equidigital number, since it uses as much as digits as its factorization.

23387281109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 23387281109 in words is "twenty-three billion, three hundred eighty-seven million, two hundred eighty-one thousand, one hundred nine".