155332442 has 4 divisors (see below), whose sum is σ = 232998666. Its totient is φ = 77666220.

The previous prime is 155332433. The next prime is 155332447. The reversal of 155332442 is 244233551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244233551 = 661 ⋅369491.

It can be written as a sum of positive squares in only one way, i.e., 146870161 + 8462281 = 12119^2 + 2909^2 .

It is not an unprimeable number, because it can be changed into a prime (155332447) 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 as a sum of consecutive naturals, namely, 38833109 + ... + 38833112.

Almost surely, 2^155332442 is an apocalyptic number.

155332442 is a deficient number, since it is larger than the sum of its proper divisors (77666224).

155332442 is an equidigital number, since it uses as much as digits as its factorization.

155332442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77666223.

The product of its digits is 14400, while the sum is 29.

The square root of 155332442 is about 12463.2436387964. The cubic root of 155332442 is about 537.5522986429.

Adding to 155332442 its reverse (244233551), we get a palindrome (399565993).

The spelling of 155332442 in words is "one hundred fifty-five million, three hundred thirty-two thousand, four hundred forty-two".