1201001000 has 32 divisors (see below), whose sum is σ = 2810344680. Its totient is φ = 480400000.

The previous prime is 1201000967. The next prime is 1201001003. The reversal of 1201001000 is 1001021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 53553124 + 1147447876 = 7318^2 + 33874^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (1201001003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599501 + ... + 601500.

Almost surely, 2^1201001000 is an apocalyptic number.

1201001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201001000 is an abundant number, since it is smaller than the sum of its proper divisors (1609343680).

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

1201001000 is a wasteful number, since it uses less digits than its factorization.

1201001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201022 (or 1201008 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1201001000 is about 34655.4613300703. The cubic root of 1201001000 is about 1062.9539651802.

Adding to 1201001000 its reverse (1001021), we get a palindrome (1202002021).

The spelling of 1201001000 in words is "one billion, two hundred one million, one thousand".