205149045 has 16 divisors (see below), whose sum is σ = 339557760. Its totient is φ = 105639744.

The previous prime is 205149037. The next prime is 205149071. The reversal of 205149045 is 540941502.

It is not a de Polignac number, because 205149045 - 2³ = 205149037 is a prime.

It is a super-2 number, since 2×205149045² = 84172261328824050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235369 + ... + 236238.

It is an arithmetic number, because the mean of its divisors is an integer number (21222360).

Almost surely, 2^205149045 is an apocalyptic number.

It is an amenable number.

205149045 is a deficient number, since it is larger than the sum of its proper divisors (134408715).

205149045 is a wasteful number, since it uses less digits than its factorization.

205149045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471644.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 205149045 is about 14323.0249947419. The cubic root of 205149045 is about 589.7797176316.

The spelling of 205149045 in words is "two hundred five million, one hundred forty-nine thousand, forty-five".