155642306 has 4 divisors (see below), whose sum is σ = 233463462. Its totient is φ = 77821152.

The previous prime is 155642287. The next prime is 155642309. The reversal of 155642306 is 603246551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 603246551 = 47 ⋅12835033.

It can be written as a sum of positive squares in only one way, i.e., 150283081 + 5359225 = 12259^2 + 2315^2 .

It is not an unprimeable number, because it can be changed into a prime (155642309) 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, 38910575 + ... + 38910578.

Almost surely, 2^155642306 is an apocalyptic number.

155642306 is a deficient number, since it is larger than the sum of its proper divisors (77821156).

155642306 is an equidigital number, since it uses as much as digits as its factorization.

155642306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77821155.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 155642306 is about 12475.6685592396. The cubic root of 155642306 is about 537.9095055616.

Adding to 155642306 its reverse (603246551), we get a palindrome (758888857).

The spelling of 155642306 in words is "one hundred fifty-five million, six hundred forty-two thousand, three hundred six".