42972109 has 2 divisors, whose sum is σ = 42972110. Its totient is φ = 42972108.

The previous prime is 42972103. The next prime is 42972131. The reversal of 42972109 is 90127924.

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., 42863209 + 108900 = 6547^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 42972109 - 2⁵ = 42972077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42972103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21486054 + 21486055.

It is an arithmetic number, because the mean of its divisors is an integer number (21486055).

Almost surely, 2^42972109 is an apocalyptic number.

It is an amenable number.

42972109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42972109 is an equidigital number, since it uses as much as digits as its factorization.

42972109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 42972109 is about 6555.3115105234. The cubic root of 42972109 is about 350.2640429306.

The spelling of 42972109 in words is "forty-two million, nine hundred seventy-two thousand, one hundred nine".