1331999201 has 4 divisors (see below), whose sum is σ = 1434460692. Its totient is φ = 1229537712.

The previous prime is 1331999191. The next prime is 1331999219. The reversal of 1331999201 is 1029991331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229825600 + 1102173601 = 15160^2 + 33199^2 .

It is not a de Polignac number, because 1331999201 - 2²⁶ = 1264890337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331999231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51230726 + ... + 51230751.

It is an arithmetic number, because the mean of its divisors is an integer number (358615173).

Almost surely, 2^1331999201 is an apocalyptic number.

It is an amenable number.

1331999201 is a deficient number, since it is larger than the sum of its proper divisors (102461491).

1331999201 is a wasteful number, since it uses less digits than its factorization.

1331999201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102461490.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1331999201 is about 36496.5642355551. The cubic root of 1331999201 is about 1100.2751931311.

The spelling of 1331999201 in words is "one billion, three hundred thirty-one million, nine hundred ninety-nine thousand, two hundred one".