213515445 has 128 divisors (see below), whose sum is σ = 438681600. Its totient is φ = 87609600.

The previous prime is 213515443. The next prime is 213515453. The reversal of 213515445 is 544515312.

It is not a de Polignac number, because 213515445 - 2¹ = 213515443 is a prime.

It is a super-3 number, since 3×213515445³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213515443) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6887580 + ... + 6887610.

It is an arithmetic number, because the mean of its divisors is an integer number (3427200).

Almost surely, 2^213515445 is an apocalyptic number.

It is an amenable number.

213515445 is an abundant number, since it is smaller than the sum of its proper divisors (225166155).

213515445 is a wasteful number, since it uses less digits than its factorization.

213515445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 82 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 213515445 is about 14612.1677036640. The cubic root of 213515445 is about 597.6906087018.

It can be divided in two parts, 21351 and 5445, that added together give a triangular number (26796 = T₂₃₁).

The spelling of 213515445 in words is "two hundred thirteen million, five hundred fifteen thousand, four hundred forty-five".