213772945 has 4 divisors (see below), whose sum is σ = 256527540. Its totient is φ = 171018352.

The previous prime is 213772921. The next prime is 213772957. The reversal of 213772945 is 549277312.

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 120824064 + 92948881 = 10992^2 + 9641^2 .

It is a cyclic number.

It is not a de Polignac number, because 213772945 - 2¹³ = 213764753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213772898 and 213772907.

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, 21377290 + ... + 21377299.

It is an arithmetic number, because the mean of its divisors is an integer number (64131885).

Almost surely, 2^213772945 is an apocalyptic number.

It is an amenable number.

213772945 is a deficient number, since it is larger than the sum of its proper divisors (42754595).

213772945 is an equidigital number, since it uses as much as digits as its factorization.

213772945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42754594.

The product of its digits is 105840, while the sum is 40.

The square root of 213772945 is about 14620.9761985991. The cubic root of 213772945 is about 597.9307841500.

The spelling of 213772945 in words is "two hundred thirteen million, seven hundred seventy-two thousand, nine hundred forty-five".