165243031 has 2 divisors, whose sum is σ = 165243032. Its totient is φ = 165243030.

The previous prime is 165242983. The next prime is 165243037. The reversal of 165243031 is 130342561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165243031 - 2¹¹ = 165240983 is a prime.

It is a super-2 number, since 2×165243031² = 54610518588133922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165242987 and 165243005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165243037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82621515 + 82621516.

It is an arithmetic number, because the mean of its divisors is an integer number (82621516).

Almost surely, 2^165243031 is an apocalyptic number.

165243031 is a deficient number, since it is larger than the sum of its proper divisors (1).

165243031 is an equidigital number, since it uses as much as digits as its factorization.

165243031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 165243031 is about 12854.6890666402. The cubic root of 165243031 is about 548.7498116275.

Adding to 165243031 its reverse (130342561), we get a palindrome (295585592).

The spelling of 165243031 in words is "one hundred sixty-five million, two hundred forty-three thousand, thirty-one".