505661941 has 4 divisors (see below), whose sum is σ = 505717632. Its totient is φ = 505606252.

The previous prime is 505661939. The next prime is 505661963. The reversal of 505661941 is 149166505.

505661941 = T₁₈₃₅₉ + T₁₈₃₆₀ + T₁₈₃₆₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 149166505 = 5 ⋅29833301.

It is a cyclic number.

It is not a de Polignac number, because 505661941 - 2¹ = 505661939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505661941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505661921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10711 + ... + 33556.

It is an arithmetic number, because the mean of its divisors is an integer number (126429408).

Almost surely, 2^505661941 is an apocalyptic number.

505661941 is the 18361-st centered triangular number.

It is an amenable number.

505661941 is a deficient number, since it is larger than the sum of its proper divisors (55691).

505661941 is a wasteful number, since it uses less digits than its factorization.

505661941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55690.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 505661941 is about 22486.9282250822. The cubic root of 505661941 is about 796.6852117981.

The spelling of 505661941 in words is "five hundred five million, six hundred sixty-one thousand, nine hundred forty-one".