431906681 has 2 divisors, whose sum is σ = 431906682. Its totient is φ = 431906680.

The previous prime is 431906639. The next prime is 431906693. The reversal of 431906681 is 186609134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235346281 + 196560400 = 15341^2 + 14020^2 .

It is a cyclic number.

It is not a de Polignac number, because 431906681 - 2¹⁰ = 431905657 is a prime.

It is a super-2 number, since 2×431906681² = 373086762184871522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431906281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215953340 + 215953341.

It is an arithmetic number, because the mean of its divisors is an integer number (215953341).

Almost surely, 2^431906681 is an apocalyptic number.

It is an amenable number.

431906681 is a deficient number, since it is larger than the sum of its proper divisors (1).

431906681 is an equidigital number, since it uses as much as digits as its factorization.

431906681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 431906681 is about 20782.3646633390. The cubic root of 431906681 is about 755.8981933446.

The spelling of 431906681 in words is "four hundred thirty-one million, nine hundred six thousand, six hundred eighty-one".