3121201000 has 32 divisors (see below), whose sum is σ = 7303612680. Its totient is φ = 1248480000.

The previous prime is 3121200989. The next prime is 3121201001. The reversal of 3121201000 is 1021213.

It can be written as a sum of positive squares in 4 ways, for example, as 1632321604 + 1488879396 = 40402^2 + 38586^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (3121201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559601 + ... + 1561600.

Almost surely, 2^3121201000 is an apocalyptic number.

It is an amenable number.

3121201000 is an abundant number, since it is smaller than the sum of its proper divisors (4182411680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121201000 is a wasteful number, since it uses less digits than its factorization.

3121201000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121222 (or 3121208 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 3121201000 is about 55867.7098152412. The cubic root of 3121201000 is about 1461.4161838890.

Adding to 3121201000 its reverse (1021213), we get a palindrome (3122222213).

The spelling of 3121201000 in words is "three billion, one hundred twenty-one million, two hundred one thousand".