153909493 has 2 divisors, whose sum is σ = 153909494. Its totient is φ = 153909492.

The previous prime is 153909461. The next prime is 153909521. The reversal of 153909493 is 394909351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83046769 + 70862724 = 9113^2 + 8418^2 .

It is an emirp because it is prime and its reverse (394909351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 153909493 - 2⁵ = 153909461 is a prime.

It is a super-3 number, since 3×153909493³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (153909433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76954746 + 76954747.

It is an arithmetic number, because the mean of its divisors is an integer number (76954747).

Almost surely, 2^153909493 is an apocalyptic number.

It is an amenable number.

153909493 is a deficient number, since it is larger than the sum of its proper divisors (1).

153909493 is an equidigital number, since it uses as much as digits as its factorization.

153909493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 153909493 is about 12406.0264790947. The cubic root of 153909493 is about 535.9058146029.

The spelling of 153909493 in words is "one hundred fifty-three million, nine hundred nine thousand, four hundred ninety-three".