201215454 has 128 divisors (see below), whose sum is σ = 485968896. Its totient is φ = 54912000.

The previous prime is 201215419. The next prime is 201215459. The reversal of 201215454 is 454512102.

It is a super-2 number, since 2×201215454² = 80975317856852232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201215459) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3298584 + ... + 3298644.

It is an arithmetic number, because the mean of its divisors is an integer number (3796632).

Almost surely, 2^201215454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201215454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242984448).

201215454 is an abundant number, since it is smaller than the sum of its proper divisors (284753442).

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

201215454 is a wasteful number, since it uses less digits than its factorization.

201215454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 201215454 is about 14185.0433203427. The cubic root of 201215454 is about 585.9858255452.

Adding to 201215454 its reverse (454512102), we get a palindrome (655727556).

The spelling of 201215454 in words is "two hundred one million, two hundred fifteen thousand, four hundred fifty-four".