100155445 has 16 divisors (see below), whose sum is σ = 130162032. Its totient is φ = 73543680.

The previous prime is 100155443. The next prime is 100155457. The reversal of 100155445 is 544551001.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8168164 + 91987281 = 2858^2 + 9591^2 .

It is not a de Polignac number, because 100155445 - 2¹ = 100155443 is a prime.

It is a super-2 number, since 2×100155445² = 20062226326296050, which contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7509 + ... + 16021.

It is an arithmetic number, because the mean of its divisors is an integer number (8135127).

Almost surely, 2^100155445 is an apocalyptic number.

It is an amenable number.

100155445 is a deficient number, since it is larger than the sum of its proper divisors (30006587).

100155445 is a wasteful number, since it uses less digits than its factorization.

100155445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8712.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 100155445 is about 10007.7692319517. The cubic root of 100155445 is about 464.3992627771.

The spelling of 100155445 in words is "one hundred million, one hundred fifty-five thousand, four hundred forty-five".