213970237 has 6 divisors (see below), whose sum is σ = 230486298. Its totient is φ = 197462304.

The previous prime is 213970231. The next prime is 213970241. The reversal of 213970237 is 732079312.

It can be written as a sum of positive squares in 3 ways, for example, as 9308601 + 204661636 = 3051^2 + 14306^2 .

It is not a de Polignac number, because 213970237 - 2²⁷ = 79752509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213970231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50713 + ... + 54769.

It is an arithmetic number, because the mean of its divisors is an integer number (38414383).

Almost surely, 2^213970237 is an apocalyptic number.

It is an amenable number.

213970237 is a deficient number, since it is larger than the sum of its proper divisors (16516061).

213970237 is an frugal number, since it uses more digits than its factorization.

213970237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8127 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 213970237 is about 14627.7215245574. The cubic root of 213970237 is about 598.1146719164.

The spelling of 213970237 in words is "two hundred thirteen million, nine hundred seventy thousand, two hundred thirty-seven".