421131091 has 2 divisors, whose sum is σ = 421131092. Its totient is φ = 421131090.

The previous prime is 421131083. The next prime is 421131101. The reversal of 421131091 is 190131124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421131091 - 2³ = 421131083 is a prime.

It is a super-3 number, since 3×421131091³ (a number of 27 digits) contains 333 as substring.

It is equal to p_22401490 and since 421131091 and 22401490 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421131031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210565545 + 210565546.

It is an arithmetic number, because the mean of its divisors is an integer number (210565546).

Almost surely, 2^421131091 is an apocalyptic number.

421131091 is a deficient number, since it is larger than the sum of its proper divisors (1).

421131091 is an equidigital number, since it uses as much as digits as its factorization.

421131091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 421131091 is about 20521.4787722523. The cubic root of 421131091 is about 749.5589056689.

The spelling of 421131091 in words is "four hundred twenty-one million, one hundred thirty-one thousand, ninety-one".