100505149 has 4 divisors (see below), whose sum is σ = 101010400. Its totient is φ = 99999900.

The previous prime is 100505113. The next prime is 100505161. The reversal of 100505149 is 941505001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 941505001 = 907 ⋅1038043.

It is a cyclic number.

It is not a de Polignac number, because 100505149 - 2⁷ = 100505021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100505549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252327 + ... + 252724.

It is an arithmetic number, because the mean of its divisors is an integer number (25252600).

Almost surely, 2^100505149 is an apocalyptic number.

It is an amenable number.

100505149 is a deficient number, since it is larger than the sum of its proper divisors (505251).

100505149 is an equidigital number, since it uses as much as digits as its factorization.

100505149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505250.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 100505149 is about 10025.2256333711. The cubic root of 100505149 is about 464.9391356727.

The spelling of 100505149 in words is "one hundred million, five hundred five thousand, one hundred forty-nine".