100155442 has 4 divisors (see below), whose sum is σ = 150233166. Its totient is φ = 50077720.

The previous prime is 100155439. The next prime is 100155443. The reversal of 100155442 is 244551001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244551001 = 17 ⋅14385353.

It can be written as a sum of positive squares in only one way, i.e., 93296281 + 6859161 = 9659^2 + 2619^2 .

It is a super-2 number, since 2×100155442² = 20062225124430728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100155443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25038859 + ... + 25038862.

Almost surely, 2^100155442 is an apocalyptic number.

100155442 is a deficient number, since it is larger than the sum of its proper divisors (50077724).

100155442 is an equidigital number, since it uses as much as digits as its factorization.

100155442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50077723.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 100155442 is about 10007.7690820682. The cubic root of 100155442 is about 464.3992581403.

The spelling of 100155442 in words is "one hundred million, one hundred fifty-five thousand, four hundred forty-two".