1201451520 has 160 divisors (see below), whose sum is σ = 3895322112. Its totient is φ = 315850752.

The previous prime is 1201451509. The next prime is 1201451521. The reversal of 1201451520 is 251541021.

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (1201451521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559569 + ... + 561711.

Almost surely, 2^1201451520 is an apocalyptic number.

1201451520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947661056).

1201451520 is an abundant number, since it is smaller than the sum of its proper divisors (2693870592).

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

1201451520 is an equidigital number, since it uses as much as digits as its factorization.

1201451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242 (or 2226 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1201451520 is about 34661.9607062266. The cubic root of 1201451520 is about 1063.0868604770.

Adding to 1201451520 its reverse (251541021), we get a palindrome (1452992541).

The spelling of 1201451520 in words is "one billion, two hundred one million, four hundred fifty-one thousand, five hundred twenty".