53981309 has 2 divisors, whose sum is σ = 53981310. Its totient is φ = 53981308.

The previous prime is 53981251. The next prime is 53981327. The reversal of 53981309 is 90318935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 14417209 = 6290^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 53981309 - 2¹² = 53977213 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 (53981399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26990654 + 26990655.

It is an arithmetic number, because the mean of its divisors is an integer number (26990655).

Almost surely, 2^53981309 is an apocalyptic number.

It is an amenable number.

53981309 is a deficient number, since it is larger than the sum of its proper divisors (1).

53981309 is an equidigital number, since it uses as much as digits as its factorization.

53981309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 53981309 is about 7347.1973568157. The cubic root of 53981309 is about 377.9327003353.

The spelling of 53981309 in words is "fifty-three million, nine hundred eighty-one thousand, three hundred nine".