213555145 has 8 divisors (see below), whose sum is σ = 256604040. Its totient is φ = 170618880.

The previous prime is 213555137. The next prime is 213555151. The reversal of 213555145 is 541555312.

It can be written as a sum of positive squares in 4 ways, for example, as 15376 + 213539769 = 124^2 + 14613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213555145 - 2³ = 213555137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23926 + ... + 31615.

It is an arithmetic number, because the mean of its divisors is an integer number (32075505).

Almost surely, 2^213555145 is an apocalyptic number.

It is an amenable number.

213555145 is a deficient number, since it is larger than the sum of its proper divisors (43048895).

213555145 is an equidigital number, since it uses as much as digits as its factorization.

213555145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56315.

The product of its digits is 15000, while the sum is 31.

The square root of 213555145 is about 14613.5260974208. The cubic root of 213555145 is about 597.7276502792.

The spelling of 213555145 in words is "two hundred thirteen million, five hundred fifty-five thousand, one hundred forty-five".