1649830261 has 16 divisors (see below), whose sum is σ = 1721871360. Its totient is φ = 1579069440.

The previous prime is 1649830219. The next prime is 1649830267. The reversal of 1649830261 is 1620389461.

It is a cyclic number.

It is not a de Polignac number, because 1649830261 - 2²³ = 1641441653 is a prime.

It is a super-2 number, since 2×1649830261² = 5443879780222656242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649830267) 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, 1250160 + ... + 1251478.

It is an arithmetic number, because the mean of its divisors is an integer number (107616960).

Almost surely, 2^1649830261 is an apocalyptic number.

It is an amenable number.

1649830261 is a deficient number, since it is larger than the sum of its proper divisors (72041099).

1649830261 is a wasteful number, since it uses less digits than its factorization.

1649830261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1649830261 is about 40618.1026267845. The cubic root of 1649830261 is about 1181.6252289239.

The spelling of 1649830261 in words is "one billion, six hundred forty-nine million, eight hundred thirty thousand, two hundred sixty-one".