155061215 has 4 divisors (see below), whose sum is σ = 186073464. Its totient is φ = 124048968.

The previous prime is 155061209. The next prime is 155061217. The reversal of 155061215 is 512160551.

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

It is a cyclic number.

It is not a de Polignac number, because 155061215 - 2⁸ = 155060959 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 (155061217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15506117 + ... + 15506126.

It is an arithmetic number, because the mean of its divisors is an integer number (46518366).

Almost surely, 2^155061215 is an apocalyptic number.

155061215 is a deficient number, since it is larger than the sum of its proper divisors (31012249).

155061215 is an equidigital number, since it uses as much as digits as its factorization.

155061215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31012248.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 155061215 is about 12452.3578088650. The cubic root of 155061215 is about 537.2392418256.

The spelling of 155061215 in words is "one hundred fifty-five million, sixty-one thousand, two hundred fifteen".