205122451 has 4 divisors (see below), whose sum is σ = 205273872. Its totient is φ = 204971032.

The previous prime is 205122431. The next prime is 205122469. The reversal of 205122451 is 154221502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205122451 - 2²⁷ = 70904723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205122431) 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, 73660 + ... + 76393.

It is an arithmetic number, because the mean of its divisors is an integer number (51318468).

Almost surely, 2^205122451 is an apocalyptic number.

205122451 is a deficient number, since it is larger than the sum of its proper divisors (151421).

205122451 is a wasteful number, since it uses less digits than its factorization.

205122451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151420.

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

The square root of 205122451 is about 14322.0965993111. The cubic root of 205122451 is about 589.7542316414.

Adding to 205122451 its reverse (154221502), we get a palindrome (359343953).

The spelling of 205122451 in words is "two hundred five million, one hundred twenty-two thousand, four hundred fifty-one".