421671031 has 2 divisors, whose sum is σ = 421671032. Its totient is φ = 421671030.

The previous prime is 421671017. The next prime is 421671073. The reversal of 421671031 is 130176124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421671031 - 2⁷ = 421670903 is a prime.

It is a super-2 number, since 2×421671031² = 355612916769205922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421670987 and 421671005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421671091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210835515 + 210835516.

It is an arithmetic number, because the mean of its divisors is an integer number (210835516).

Almost surely, 2^421671031 is an apocalyptic number.

421671031 is a deficient number, since it is larger than the sum of its proper divisors (1).

421671031 is an equidigital number, since it uses as much as digits as its factorization.

421671031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 421671031 is about 20534.6300429299. The cubic root of 421671031 is about 749.8791099967.

The spelling of 421671031 in words is "four hundred twenty-one million, six hundred seventy-one thousand, thirty-one".