1949443771 has 16 divisors (see below), whose sum is σ = 2329417440. Its totient is φ = 1610452480.

The previous prime is 1949443763. The next prime is 1949443787. The reversal of 1949443771 is 1773449491.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1949443771 - 2³ = 1949443763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949443751) 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, 174316 + ... + 185161.

It is an arithmetic number, because the mean of its divisors is an integer number (145588590).

Almost surely, 2^1949443771 is an apocalyptic number.

1949443771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1949443771 is a deficient number, since it is larger than the sum of its proper divisors (379973669).

1949443771 is a wasteful number, since it uses less digits than its factorization.

1949443771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359534.

The product of its digits is 762048, while the sum is 49.

The square root of 1949443771 is about 44152.5058292279. The cubic root of 1949443771 is about 1249.2141772363.

The spelling of 1949443771 in words is "one billion, nine hundred forty-nine million, four hundred forty-three thousand, seven hundred seventy-one".