531661995 has 32 divisors (see below), whose sum is σ = 1000779840. Its totient is φ = 266872320.

The previous prime is 531661981. The next prime is 531662011. The reversal of 531661995 is 599166135.

It is not a de Polignac number, because 531661995 - 2¹⁸ = 531399851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 531661995.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113536 + ... + 118125.

It is an arithmetic number, because the mean of its divisors is an integer number (31274370).

Almost surely, 2^531661995 is an apocalyptic number.

531661995 is a deficient number, since it is larger than the sum of its proper divisors (469117845).

531661995 is a wasteful number, since it uses less digits than its factorization.

531661995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231692 (or 231686 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 531661995 is about 23057.7968375125. The cubic root of 531661995 is about 810.1122615324.

The spelling of 531661995 in words is "five hundred thirty-one million, six hundred sixty-one thousand, nine hundred ninety-five".