842661431 has 2 divisors, whose sum is σ = 842661432. Its totient is φ = 842661430.

The previous prime is 842661367. The next prime is 842661433. The reversal of 842661431 is 134166248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842661431 - 2⁶ = 842661367 is a prime.

It is a super-2 number, since 2×842661431² = 1420156574589935522, which contains 22 as substring.

Together with 842661433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 842661391 and 842661400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842661433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421330715 + 421330716.

It is an arithmetic number, because the mean of its divisors is an integer number (421330716).

Almost surely, 2^842661431 is an apocalyptic number.

842661431 is a deficient number, since it is larger than the sum of its proper divisors (1).

842661431 is an equidigital number, since it uses as much as digits as its factorization.

842661431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 842661431 is about 29028.6312284958. The cubic root of 842661431 is about 944.5342389052.

The spelling of 842661431 in words is "eight hundred forty-two million, six hundred sixty-one thousand, four hundred thirty-one".