999531497 has 4 divisors (see below), whose sum is σ = 1023910356. Its totient is φ = 975152640.

The previous prime is 999531437. The next prime is 999531523. The reversal of 999531497 is 794135999.

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 70744921 + 928786576 = 8411^2 + 30476^2 .

It is a cyclic number.

It is not a de Polignac number, because 999531497 - 2¹⁸ = 999269353 is a prime.

It is a super-2 number, since 2×999531497² = 1998126426990122018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999531427) 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, 12189368 + ... + 12189449.

It is an arithmetic number, because the mean of its divisors is an integer number (255977589).

Almost surely, 2^999531497 is an apocalyptic number.

It is an amenable number.

999531497 is a deficient number, since it is larger than the sum of its proper divisors (24378859).

999531497 is a wasteful number, since it uses less digits than its factorization.

999531497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24378858.

The product of its digits is 2755620, while the sum is 56.

The square root of 999531497 is about 31615.3680509970. The cubic root of 999531497 is about 999.8438079386.

The spelling of 999531497 in words is "nine hundred ninety-nine million, five hundred thirty-one thousand, four hundred ninety-seven".