1649136497 has 4 divisors (see below), whose sum is σ = 1650344256. Its totient is φ = 1647928740.

The previous prime is 1649136491. The next prime is 1649136551. The reversal of 1649136497 is 7946319461.

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 a cyclic number.

It is not a de Polignac number, because 1649136497 - 2¹⁶ = 1649070961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649136491) 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, 601829 + ... + 604562.

It is an arithmetic number, because the mean of its divisors is an integer number (412586064).

Almost surely, 2^1649136497 is an apocalyptic number.

It is an amenable number.

1649136497 is a deficient number, since it is larger than the sum of its proper divisors (1207759).

1649136497 is a wasteful number, since it uses less digits than its factorization.

1649136497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207758.

The product of its digits is 979776, while the sum is 50.

The square root of 1649136497 is about 40609.5616450116. The cubic root of 1649136497 is about 1181.4595787562.

The spelling of 1649136497 in words is "one billion, six hundred forty-nine million, one hundred thirty-six thousand, four hundred ninety-seven".