155115442 has 4 divisors (see below), whose sum is σ = 232673166. Its totient is φ = 77557720.

The previous prime is 155115431. The next prime is 155115469. The reversal of 155115442 is 244511551.

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

It can be written as a sum of positive squares in only one way, i.e., 122522761 + 32592681 = 11069^2 + 5709^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155115442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38778859 + ... + 38778862.

Almost surely, 2^155115442 is an apocalyptic number.

155115442 is a deficient number, since it is larger than the sum of its proper divisors (77557724).

155115442 is an equidigital number, since it uses as much as digits as its factorization.

155115442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77557723.

The product of its digits is 4000, while the sum is 28.

The square root of 155115442 is about 12454.5349973413. The cubic root of 155115442 is about 537.3018611316.

Adding to 155115442 its reverse (244511551), we get a palindrome (399626993).

The spelling of 155115442 in words is "one hundred fifty-five million, one hundred fifteen thousand, four hundred forty-two".