1949405165 has 4 divisors (see below), whose sum is σ = 2339286204. Its totient is φ = 1559524128.

The previous prime is 1949405119. The next prime is 1949405179. The reversal of 1949405165 is 5615049491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5615049491 = 44887 ⋅125093.

It can be written as a sum of positive squares in 2 ways, for example, as 638168644 + 1311236521 = 25262^2 + 36211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949405165 - 2¹⁰ = 1949404141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194940512 + ... + 194940521.

It is an arithmetic number, because the mean of its divisors is an integer number (584821551).

Almost surely, 2^1949405165 is an apocalyptic number.

It is an amenable number.

1949405165 is a deficient number, since it is larger than the sum of its proper divisors (389881039).

1949405165 is an equidigital number, since it uses as much as digits as its factorization.

1949405165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389881038.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1949405165 is about 44152.0686378339. The cubic root of 1949405165 is about 1249.2059308702.

The spelling of 1949405165 in words is "one billion, nine hundred forty-nine million, four hundred five thousand, one hundred sixty-five".