1649609497 has 4 divisors (see below), whose sum is σ = 1677569040. Its totient is φ = 1621649956.

The previous prime is 1649609491. The next prime is 1649609503. The reversal of 1649609497 is 7949069461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1649609491) and next prime (1649609503).

It is a cyclic number.

It is not a de Polignac number, because 1649609497 - 2¹⁹ = 1649085209 is a prime.

It is a super-2 number, since 2×1649609497² = 5442422985185186018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649609491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13979683 + ... + 13979800.

It is an arithmetic number, because the mean of its divisors is an integer number (419392260).

Almost surely, 2^1649609497 is an apocalyptic number.

It is an amenable number.

1649609497 is a deficient number, since it is larger than the sum of its proper divisors (27959543).

1649609497 is an equidigital number, since it uses as much as digits as its factorization.

1649609497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27959542.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 1649609497 is about 40615.3849790938. The cubic root of 1649609497 is about 1181.5725220981.

The spelling of 1649609497 in words is "one billion, six hundred forty-nine million, six hundred nine thousand, four hundred ninety-seven".