1201531400 has 24 divisors (see below), whose sum is σ = 2793560970. Its totient is φ = 480612480.

The previous prime is 1201531399. The next prime is 1201531403. The reversal of 1201531400 is 41351021.

It can be written as a sum of positive squares in 3 ways, for example, as 1175255524 + 26275876 = 34282^2 + 5126^2 .

It is not an unprimeable number, because it can be changed into a prime (1201531403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3003629 + ... + 3004028.

Almost surely, 2^1201531400 is an apocalyptic number.

1201531400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201531400 is an abundant number, since it is smaller than the sum of its proper divisors (1592029570).

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

1201531400 is a wasteful number, since it uses less digits than its factorization.

1201531400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007673 (or 6007664 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1201531400 is about 34663.1129588789. The cubic root of 1201531400 is about 1063.1104201727.

Adding to 1201531400 its reverse (41351021), we get a palindrome (1242882421).

The spelling of 1201531400 in words is "one billion, two hundred one million, five hundred thirty-one thousand, four hundred".