15742109 has 2 divisors, whose sum is σ = 15742110. Its totient is φ = 15742108.

The previous prime is 15742091. The next prime is 15742117. The reversal of 15742109 is 90124751.

15742109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (15742091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11539609 + 4202500 = 3397^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 15742109 - 2⁸ = 15741853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15742159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7871054 + 7871055.

It is an arithmetic number, because the mean of its divisors is an integer number (7871055).

Almost surely, 2^15742109 is an apocalyptic number.

It is an amenable number.

15742109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15742109 is an equidigital number, since it uses as much as digits as its factorization.

15742109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 15742109 is about 3967.6326694895. The cubic root of 15742109 is about 250.6230273910.

It can be divided in two parts, 15742 and 109, that multiplied together give a triangular number (1715878 = T₁₈₅₂).

The spelling of 15742109 in words is "fifteen million, seven hundred forty-two thousand, one hundred nine".