205431151 has 4 divisors (see below), whose sum is σ = 206230752. Its totient is φ = 204631552.

The previous prime is 205431137. The next prime is 205431181. The reversal of 205431151 is 151134502.

It is a happy number.

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 205431151 - 2²³ = 197042543 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 (205431181) 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, 399415 + ... + 399928.

It is an arithmetic number, because the mean of its divisors is an integer number (51557688).

Almost surely, 2^205431151 is an apocalyptic number.

205431151 is a deficient number, since it is larger than the sum of its proper divisors (799601).

205431151 is an equidigital number, since it uses as much as digits as its factorization.

205431151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799600.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 205431151 is about 14332.8696010255. The cubic root of 205431151 is about 590.0499344886.

Adding to 205431151 its reverse (151134502), we get a palindrome (356565653).

The spelling of 205431151 in words is "two hundred five million, four hundred thirty-one thousand, one hundred fifty-one".