155540249 has 4 divisors (see below), whose sum is σ = 158849664. Its totient is φ = 152230836.

The previous prime is 155540243. The next prime is 155540261. The reversal of 155540249 is 942045551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155540249 - 2²⁴ = 138763033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155540243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654637 + ... + 1654730.

It is an arithmetic number, because the mean of its divisors is an integer number (39712416).

Almost surely, 2^155540249 is an apocalyptic number.

It is an amenable number.

155540249 is a deficient number, since it is larger than the sum of its proper divisors (3309415).

155540249 is an equidigital number, since it uses as much as digits as its factorization.

155540249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309414.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 155540249 is about 12471.5776467935. The cubic root of 155540249 is about 537.7919080711.

The spelling of 155540249 in words is "one hundred fifty-five million, five hundred forty thousand, two hundred forty-nine".