155231242 has 8 divisors (see below), whose sum is σ = 236793600. Its totient is φ = 76300044.

The previous prime is 155231227. The next prime is 155231261. The reversal of 155231242 is 242132551.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 657642 + ... + 657877.

It is an arithmetic number, because the mean of its divisors is an integer number (29599200).

Almost surely, 2^155231242 is an apocalyptic number.

155231242 is a deficient number, since it is larger than the sum of its proper divisors (81562358).

155231242 is a wasteful number, since it uses less digits than its factorization.

155231242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315580.

The product of its digits is 2400, while the sum is 25.

The square root of 155231242 is about 12459.1830390279. The cubic root of 155231242 is about 537.4355337864.

Adding to 155231242 its reverse (242132551), we get a palindrome (397363793).

The spelling of 155231242 in words is "one hundred fifty-five million, two hundred thirty-one thousand, two hundred forty-two".