155994253 has 4 divisors (see below), whose sum is σ = 156786300. Its totient is φ = 155202208.

The previous prime is 155994247. The next prime is 155994271. The reversal of 155994253 is 352499551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352499551 = 797 ⋅442283.

It can be written as a sum of positive squares in 2 ways, for example, as 81396484 + 74597769 = 9022^2 + 8637^2 .

It is a cyclic number.

It is not a de Polignac number, because 155994253 - 2⁹ = 155993741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155994203) 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 in 3 ways as a sum of consecutive naturals, for example, 395728 + ... + 396121.

It is an arithmetic number, because the mean of its divisors is an integer number (39196575).

Almost surely, 2^155994253 is an apocalyptic number.

It is an amenable number.

155994253 is a deficient number, since it is larger than the sum of its proper divisors (792047).

155994253 is an equidigital number, since it uses as much as digits as its factorization.

155994253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792046.

The product of its digits is 243000, while the sum is 43.

The square root of 155994253 is about 12489.7659305529. The cubic root of 155994253 is about 538.3146505885.

The spelling of 155994253 in words is "one hundred fifty-five million, nine hundred ninety-four thousand, two hundred fifty-three".