205125501 has 32 divisors (see below), whose sum is σ = 337075200. Its totient is φ = 108328320.

The previous prime is 205125499. The next prime is 205125517. The reversal of 205125501 is 105521502.

It is not a de Polignac number, because 205125501 - 2¹ = 205125499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205125551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10090 + ... + 22628.

It is an arithmetic number, because the mean of its divisors is an integer number (10533600).

Almost surely, 2^205125501 is an apocalyptic number.

205125501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

205125501 is a deficient number, since it is larger than the sum of its proper divisors (131949699).

205125501 is a wasteful number, since it uses less digits than its factorization.

205125501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12609.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 205125501 is about 14322.2030777391. The cubic root of 205125501 is about 589.7571546784.

The spelling of 205125501 in words is "two hundred five million, one hundred twenty-five thousand, five hundred one".