876431021 has 2 divisors, whose sum is σ = 876431022. Its totient is φ = 876431020.

The previous prime is 876430979. The next prime is 876431027. The reversal of 876431021 is 120134678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 744525796 + 131905225 = 27286^2 + 11485^2 .

It is a cyclic number.

It is not a de Polignac number, because 876431021 - 2⁶ = 876430957 is a prime.

It is a super-2 number, since 2×876431021² = 1536262669142204882, which contains 22 as substring.

It is a Chen prime.

It is equal to p_44866022 and since 876431021 and 44866022 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (876431027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438215510 + 438215511.

It is an arithmetic number, because the mean of its divisors is an integer number (438215511).

Almost surely, 2^876431021 is an apocalyptic number.

It is an amenable number.

876431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

876431021 is an equidigital number, since it uses as much as digits as its factorization.

876431021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 876431021 is about 29604.5777034566. The cubic root of 876431021 is about 956.9867254297.

Adding to 876431021 its reverse (120134678), we get a palindrome (996565699).

The spelling of 876431021 in words is "eight hundred seventy-six million, four hundred thirty-one thousand, twenty-one".