213957145 has 4 divisors (see below), whose sum is σ = 256748580. Its totient is φ = 171165712.

The previous prime is 213957103. The next prime is 213957173. The reversal of 213957145 is 541759312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50424201 + 163532944 = 7101^2 + 12788^2 .

It is a cyclic number.

It is not a de Polignac number, because 213957145 - 2¹³ = 213948953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21395710 + ... + 21395719.

It is an arithmetic number, because the mean of its divisors is an integer number (64187145).

Almost surely, 2^213957145 is an apocalyptic number.

It is an amenable number.

213957145 is a deficient number, since it is larger than the sum of its proper divisors (42791435).

213957145 is an equidigital number, since it uses as much as digits as its factorization.

213957145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42791434.

The product of its digits is 37800, while the sum is 37.

The square root of 213957145 is about 14627.2740112435. The cubic root of 213957145 is about 598.1024729036.

The spelling of 213957145 in words is "two hundred thirteen million, nine hundred fifty-seven thousand, one hundred forty-five".