1216901532 has 96 divisors (see below), whose sum is σ = 3588770304. Its totient is φ = 311731200.

The previous prime is 1216901507. The next prime is 1216901537. The reversal of 1216901532 is 2351096121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216901532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216901537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58432 + ... + 76472.

It is an arithmetic number, because the mean of its divisors is an integer number (37383024).

Almost surely, 2^1216901532 is an apocalyptic number.

1216901532 is a gapful number since it is divisible by the number (12) 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 1216901532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1794385152).

1216901532 is an abundant number, since it is smaller than the sum of its proper divisors (2371868772).

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

1216901532 is a wasteful number, since it uses less digits than its factorization.

1216901532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18139 (or 18137 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1216901532 is about 34884.1157548819. The cubic root of 1216901532 is about 1067.6243716829.

Adding to 1216901532 its reverse (2351096121), we get a palindrome (3567997653).

The spelling of 1216901532 in words is "one billion, two hundred sixteen million, nine hundred one thousand, five hundred thirty-two".