999650497 has 8 divisors (see below), whose sum is σ = 1027333800. Its totient is φ = 972002304.

The previous prime is 999650467. The next prime is 999650513. The reversal of 999650497 is 794056999.

It can be written as a sum of positive squares in 4 ways, for example, as 23775376 + 975875121 = 4876^2 + 31239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999650497 - 2¹¹ = 999648449 is a prime.

It is a super-2 number, since 2×999650497² = 1998602232304694018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999650467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55329 + ... + 71137.

It is an arithmetic number, because the mean of its divisors is an integer number (128416725).

Almost surely, 2^999650497 is an apocalyptic number.

999650497 is the 15809-th decagonal number.

It is an amenable number.

999650497 is a deficient number, since it is larger than the sum of its proper divisors (27683303).

999650497 is a wasteful number, since it uses less digits than its factorization.

999650497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17555.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The square root of 999650497 is about 31617.2499911045. The cubic root of 999650497 is about 999.8834854249.

The spelling of 999650497 in words is "nine hundred ninety-nine million, six hundred fifty thousand, four hundred ninety-seven".