1949433901 has 4 divisors (see below), whose sum is σ = 1962517500. Its totient is φ = 1936350304.

The previous prime is 1949433887. The next prime is 1949433923. The reversal of 1949433901 is 1093349491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1093349491 = 13 ⋅84103807.

It can be written as a sum of positive squares in 2 ways, for example, as 128278276 + 1821155625 = 11326^2 + 42675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949433901 - 2⁵ = 1949433869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949436901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6541576 + ... + 6541873.

It is an arithmetic number, because the mean of its divisors is an integer number (490629375).

Almost surely, 2^1949433901 is an apocalyptic number.

It is an amenable number.

1949433901 is a deficient number, since it is larger than the sum of its proper divisors (13083599).

1949433901 is a wasteful number, since it uses less digits than its factorization.

1949433901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13083598.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1949433901 is about 44152.3940574008. The cubic root of 1949433901 is about 1249.2120689828.

The spelling of 1949433901 in words is "one billion, nine hundred forty-nine million, four hundred thirty-three thousand, nine hundred one".