531046661 has 4 divisors (see below), whose sum is σ = 534923052. Its totient is φ = 527170272.

The previous prime is 531046657. The next prime is 531046667. The reversal of 531046661 is 166640135.

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

It can be written as a sum of positive squares in 2 ways, for example, as 397204900 + 133841761 = 19930^2 + 11569^2 .

It is a cyclic number.

It is not a de Polignac number, because 531046661 - 2² = 531046657 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 (531046667) 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, 1937990 + ... + 1938263.

It is an arithmetic number, because the mean of its divisors is an integer number (133730763).

Almost surely, 2^531046661 is an apocalyptic number.

It is an amenable number.

531046661 is a deficient number, since it is larger than the sum of its proper divisors (3876391).

531046661 is a wasteful number, since it uses less digits than its factorization.

531046661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876390.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 531046661 is about 23044.4496788272. The cubic root of 531046661 is about 809.7996054586.

Adding to 531046661 its reverse (166640135), we get a palindrome (697686796).

The spelling of 531046661 in words is "five hundred thirty-one million, forty-six thousand, six hundred sixty-one".