1649829731 has 4 divisors (see below), whose sum is σ = 1799814264. Its totient is φ = 1499845200.

The previous prime is 1649829677. The next prime is 1649829751. The reversal of 1649829731 is 1379289461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1649829731 - 2¹⁰ = 1649828707 is a prime.

It is a super-2 number, since 2×1649829731² = 5443876282583064722, which contains 22 as substring.

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 1649829731.

It is not an unprimeable number, because it can be changed into a prime (1649829751) 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, 74992250 + ... + 74992271.

It is an arithmetic number, because the mean of its divisors is an integer number (449953566).

Almost surely, 2^1649829731 is an apocalyptic number.

1649829731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1649829731 is a deficient number, since it is larger than the sum of its proper divisors (149984533).

1649829731 is a wasteful number, since it uses less digits than its factorization.

1649829731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149984532.

The product of its digits is 653184, while the sum is 50.

The square root of 1649829731 is about 40618.0961025994. The cubic root of 1649829731 is about 1181.6251023934.

The spelling of 1649829731 in words is "one billion, six hundred forty-nine million, eight hundred twenty-nine thousand, seven hundred thirty-one".