1109423639 has 2 divisors, whose sum is σ = 1109423640. Its totient is φ = 1109423638.

The previous prime is 1109423599. The next prime is 1109423647. The reversal of 1109423639 is 9363249011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1109423639 - 2¹² = 1109419543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109423839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554711819 + 554711820.

It is an arithmetic number, because the mean of its divisors is an integer number (554711820).

Almost surely, 2^1109423639 is an apocalyptic number.

1109423639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109423639 is an equidigital number, since it uses as much as digits as its factorization.

1109423639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 1109423639 is about 33308.0116338397. The cubic root of 1109423639 is about 1035.2195661663.

The spelling of 1109423639 in words is "one billion, one hundred nine million, four hundred twenty-three thousand, six hundred thirty-nine".