1649131 has 4 divisors (see below), whose sum is σ = 1799064. Its totient is φ = 1499200.

The previous prime is 1649129. The next prime is 1649147. The reversal of 1649131 is 1319461.

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 1649131 - 2¹ = 1649129 is a prime.

It is a super-2 number, since 2×1649131² = 5439266110322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649096 and 1649105.

It is not an unprimeable number, because it can be changed into a prime (1649101) 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, 74950 + ... + 74971.

It is an arithmetic number, because the mean of its divisors is an integer number (449766).

2^1649131 is an apocalyptic number.

1649131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1649131 is a deficient number, since it is larger than the sum of its proper divisors (149933).

1649131 is a wasteful number, since it uses less digits than its factorization.

1649131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149932.

The product of its digits is 648, while the sum is 25.

The square root of 1649131 is about 1284.1849555263. The cubic root of 1649131 is about 118.1458266051.

The spelling of 1649131 in words is "one million, six hundred forty-nine thousand, one hundred thirty-one".