155241215 has 4 divisors (see below), whose sum is σ = 186289464. Its totient is φ = 124192968.

The previous prime is 155241209. The next prime is 155241221. The reversal of 155241215 is 512142551.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (155241209) and next prime (155241221).

It is a cyclic number.

It is not a de Polignac number, because 155241215 - 2⁴ = 155241199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15524117 + ... + 15524126.

It is an arithmetic number, because the mean of its divisors is an integer number (46572366).

Almost surely, 2^155241215 is an apocalyptic number.

155241215 is a deficient number, since it is larger than the sum of its proper divisors (31048249).

155241215 is an equidigital number, since it uses as much as digits as its factorization.

155241215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31048248.

The product of its digits is 2000, while the sum is 26.

The square root of 155241215 is about 12459.5832594834. The cubic root of 155241215 is about 537.4470429167.

Adding to 155241215 its reverse (512142551), we get a palindrome (667383766).

The spelling of 155241215 in words is "one hundred fifty-five million, two hundred forty-one thousand, two hundred fifteen".