213872431 has 2 divisors, whose sum is σ = 213872432. Its totient is φ = 213872430.

The previous prime is 213872401. The next prime is 213872443. The reversal of 213872431 is 134278312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213872431 - 2⁹ = 213871919 is a prime.

It is a super-2 number, since 2×213872431² = 91482833483699522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213872393 and 213872402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213872401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106936215 + 106936216.

It is an arithmetic number, because the mean of its divisors is an integer number (106936216).

Almost surely, 2^213872431 is an apocalyptic number.

213872431 is a deficient number, since it is larger than the sum of its proper divisors (1).

213872431 is an equidigital number, since it uses as much as digits as its factorization.

213872431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 213872431 is about 14624.3779696779. The cubic root of 213872431 is about 598.0235250977.

The spelling of 213872431 in words is "two hundred thirteen million, eight hundred seventy-two thousand, four hundred thirty-one".