165951493 has 2 divisors, whose sum is σ = 165951494. Its totient is φ = 165951492.

The previous prime is 165951481. The next prime is 165951521. The reversal of 165951493 is 394159561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106461124 + 59490369 = 10318^2 + 7713^2 .

It is a cyclic number.

It is not a de Polignac number, because 165951493 - 2¹³ = 165943301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165951893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82975746 + 82975747.

It is an arithmetic number, because the mean of its divisors is an integer number (82975747).

Almost surely, 2^165951493 is an apocalyptic number.

It is an amenable number.

165951493 is a deficient number, since it is larger than the sum of its proper divisors (1).

165951493 is an equidigital number, since it uses as much as digits as its factorization.

165951493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The square root of 165951493 is about 12882.2161525104. The cubic root of 165951493 is about 549.5329290862.

The spelling of 165951493 in words is "one hundred sixty-five million, nine hundred fifty-one thousand, four hundred ninety-three".