213701431 has 2 divisors, whose sum is σ = 213701432. Its totient is φ = 213701430.

The previous prime is 213701393. The next prime is 213701489. The reversal of 213701431 is 134107312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213701431 - 2⁹ = 213700919 is a prime.

It is a super-2 number, since 2×213701431² = 91336603222895522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213701491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106850715 + 106850716.

It is an arithmetic number, because the mean of its divisors is an integer number (106850716).

Almost surely, 2^213701431 is an apocalyptic number.

213701431 is a deficient number, since it is larger than the sum of its proper divisors (1).

213701431 is an equidigital number, since it uses as much as digits as its factorization.

213701431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 213701431 is about 14618.5303980941. The cubic root of 213701431 is about 597.8641009515.

Adding to 213701431 its reverse (134107312), we get a palindrome (347808743).

It can be divided in two parts, 21370 and 1431, that added together give a square (22801 = 151²).

The spelling of 213701431 in words is "two hundred thirteen million, seven hundred one thousand, four hundred thirty-one".