1649042997 has 16 divisors (see below), whose sum is σ = 2541064320. Its totient is φ = 931721472.

The previous prime is 1649042939. The next prime is 1649043017. The reversal of 1649042997 is 7992409461.

It is a happy number.

It is not a de Polignac number, because 1649042997 - 2¹⁹ = 1648518709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649042597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439288 + ... + 443025.

It is an arithmetic number, because the mean of its divisors is an integer number (158816520).

Almost surely, 2^1649042997 is an apocalyptic number.

It is an amenable number.

1649042997 is a deficient number, since it is larger than the sum of its proper divisors (892021323).

1649042997 is an equidigital number, since it uses as much as digits as its factorization.

1649042997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882412.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 1649042997 is about 40608.4104219803. The cubic root of 1649042997 is about 1181.4372501904.

The spelling of 1649042997 in words is "one billion, six hundred forty-nine million, forty-two thousand, nine hundred ninety-seven".