531697491 has 36 divisors (see below), whose sum is σ = 880591608. Its totient is φ = 307936512.

The previous prime is 531697477. The next prime is 531697519. The reversal of 531697491 is 194796135.

It is not a de Polignac number, because 531697491 - 2¹⁷ = 531566419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531697091) 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 35 ways as a sum of consecutive naturals, for example, 15576 + ... + 36138.

It is an arithmetic number, because the mean of its divisors is an integer number (24460878).

Almost surely, 2^531697491 is an apocalyptic number.

531697491 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

531697491 is a deficient number, since it is larger than the sum of its proper divisors (348894117).

531697491 is a wasteful number, since it uses less digits than its factorization.

531697491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20612 (or 20596 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 531697491 is about 23058.5665426106. The cubic root of 531697491 is about 810.1302899697.

The spelling of 531697491 in words is "five hundred thirty-one million, six hundred ninety-seven thousand, four hundred ninety-one".