1649652523 has 4 divisors (see below), whose sum is σ = 1736476360. Its totient is φ = 1562828688.

The previous prime is 1649652497. The next prime is 1649652533. The reversal of 1649652523 is 3252569461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3252569461 = 15913 ⋅204397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649652523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1649652523.

It is not an unprimeable number, because it can be changed into a prime (1649652533) 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, 43411890 + ... + 43411927.

It is an arithmetic number, because the mean of its divisors is an integer number (434119090).

Almost surely, 2^1649652523 is an apocalyptic number.

1649652523 is a deficient number, since it is larger than the sum of its proper divisors (86823837).

1649652523 is an equidigital number, since it uses as much as digits as its factorization.

1649652523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86823836.

The product of its digits is 388800, while the sum is 43.

The square root of 1649652523 is about 40615.9146517717. The cubic root of 1649652523 is about 1181.5827948116.

The spelling of 1649652523 in words is "one billion, six hundred forty-nine million, six hundred fifty-two thousand, five hundred twenty-three".