421591431 has 8 divisors (see below), whose sum is σ = 577314544. Its totient is φ = 273464640.

The previous prime is 421591427. The next prime is 421591439. The reversal of 421591431 is 134195124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421591431 - 2² = 421591427 is a prime.

It is a super-2 number, since 2×421591431² = 355478669385255522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421591439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1898950 + ... + 1899171.

It is an arithmetic number, because the mean of its divisors is an integer number (72164318).

Almost surely, 2^421591431 is an apocalyptic number.

421591431 is a deficient number, since it is larger than the sum of its proper divisors (155723113).

421591431 is a wasteful number, since it uses less digits than its factorization.

421591431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798161.

The product of its digits is 4320, while the sum is 30.

The square root of 421591431 is about 20532.6917621631. The cubic root of 421591431 is about 749.8319214467.

The spelling of 421591431 in words is "four hundred twenty-one million, five hundred ninety-one thousand, four hundred thirty-one".