205342154531 has 4 divisors (see below), whose sum is σ = 205354859472. Its totient is φ = 205329449592.

The previous prime is 205342154519. The next prime is 205342154543. The reversal of 205342154531 is 135451243502.

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

It is an interprime number because it is at equal distance from previous prime (205342154519) and next prime (205342154543).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205342154531 is a prime.

It is a super-2 number, since 2×205342154531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205342154491 and 205342154500.

It is not an unprimeable number, because it can be changed into a prime (205342114531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6328196 + ... + 6360561.

It is an arithmetic number, because the mean of its divisors is an integer number (51338714868).

Almost surely, 2^205342154531 is an apocalyptic number.

205342154531 is a deficient number, since it is larger than the sum of its proper divisors (12704941).

205342154531 is a wasteful number, since it uses less digits than its factorization.

205342154531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12704940.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 205342154531 in words is "two hundred five billion, three hundred forty-two million, one hundred fifty-four thousand, five hundred thirty-one".