1649095881 has 16 divisors (see below), whose sum is σ = 2254323456. Its totient is φ = 1071732816.

The previous prime is 1649095879. The next prime is 1649095907. The reversal of 1649095881 is 1885909461.

It is not a de Polignac number, because 1649095881 - 2¹ = 1649095879 is a prime.

It is a super-2 number, since 2×1649095881² = 5439034449462332322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1649095801) 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, 55246 + ... + 79688.

It is an arithmetic number, because the mean of its divisors is an integer number (140895216).

Almost surely, 2^1649095881 is an apocalyptic number.

It is an amenable number.

1649095881 is a deficient number, since it is larger than the sum of its proper divisors (605227575).

1649095881 is a wasteful number, since it uses less digits than its factorization.

1649095881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25012.

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 1649095881 is about 40609.0615626611. The cubic root of 1649095881 is about 1181.4498794264.

The spelling of 1649095881 in words is "one billion, six hundred forty-nine million, ninety-five thousand, eight hundred eighty-one".