1201521684 has 96 divisors (see below), whose sum is σ = 3168829440. Its totient is φ = 351043200.

The previous prime is 1201521661. The next prime is 1201521701. The reversal of 1201521684 is 4861251021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1959762 + ... + 1960374.

It is an arithmetic number, because the mean of its divisors is an integer number (33008640).

Almost surely, 2^1201521684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201521684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1584414720).

1201521684 is an abundant number, since it is smaller than the sum of its proper divisors (1967307756).

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

1201521684 is a wasteful number, since it uses less digits than its factorization.

1201521684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1201521684 is about 34662.9728096134. The cubic root of 1201521684 is about 1063.1075546050.

The spelling of 1201521684 in words is "one billion, two hundred one million, five hundred twenty-one thousand, six hundred eighty-four".