209013131 has 2 divisors, whose sum is σ = 209013132. Its totient is φ = 209013130.

The previous prime is 209013061. The next prime is 209013151. The reversal of 209013131 is 131310902.

209013131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (209013151) can be obtained adding 209013131 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209013131 - 2¹⁰ = 209012107 is a prime.

It is a super-2 number, since 2×209013131² = 87372977860846322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209013151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104506565 + 104506566.

It is an arithmetic number, because the mean of its divisors is an integer number (104506566).

Almost surely, 2^209013131 is an apocalyptic number.

209013131 is a deficient number, since it is larger than the sum of its proper divisors (1).

209013131 is an equidigital number, since it uses as much as digits as its factorization.

209013131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 209013131 is about 14457.2864327992. The cubic root of 209013131 is about 593.4596420977.

The spelling of 209013131 in words is "two hundred nine million, thirteen thousand, one hundred thirty-one".