207145231 has 4 divisors (see below), whose sum is σ = 214288200. Its totient is φ = 200002264.

The previous prime is 207145219. The next prime is 207145247. The reversal of 207145231 is 132541702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132541702 = 2 ⋅66270851.

It is a cyclic number.

It is not a de Polignac number, because 207145231 - 2⁹ = 207144719 is a prime.

It is a super-2 number, since 2×207145231² = 85818293452086722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 207145196 and 207145205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207145261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571441 + ... + 3571498.

It is an arithmetic number, because the mean of its divisors is an integer number (53572050).

Almost surely, 2^207145231 is an apocalyptic number.

207145231 is a deficient number, since it is larger than the sum of its proper divisors (7142969).

207145231 is an equidigital number, since it uses as much as digits as its factorization.

207145231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142968.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 207145231 is about 14392.5408111285. The cubic root of 207145231 is about 591.6864808370.

Adding to 207145231 its reverse (132541702), we get a palindrome (339686933).

The spelling of 207145231 in words is "two hundred seven million, one hundred forty-five thousand, two hundred thirty-one".