53191909 has 2 divisors, whose sum is σ = 53191910. Its totient is φ = 53191908.

The previous prime is 53191889. The next prime is 53191927. The reversal of 53191909 is 90919135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41563809 + 11628100 = 6447^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 53191909 - 2²³ = 44803301 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53191949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26595954 + 26595955.

It is an arithmetic number, because the mean of its divisors is an integer number (26595955).

Almost surely, 2^53191909 is an apocalyptic number.

It is an amenable number.

53191909 is a deficient number, since it is larger than the sum of its proper divisors (1).

53191909 is an equidigital number, since it uses as much as digits as its factorization.

53191909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 53191909 is about 7293.2783437903. The cubic root of 53191909 is about 376.0814035497.

The spelling of 53191909 in words is "fifty-three million, one hundred ninety-one thousand, nine hundred nine".