1005031421 has 8 divisors (see below), whose sum is σ = 1025015040. Its totient is φ = 985085712.

The previous prime is 1005031399. The next prime is 1005031427. The reversal of 1005031421 is 1241305001.

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

It is a cyclic number.

It is not a de Polignac number, because 1005031421 - 2¹⁸ = 1004769277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005031427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47420 + ... + 65258.

It is an arithmetic number, because the mean of its divisors is an integer number (128126880).

Almost surely, 2^1005031421 is an apocalyptic number.

It is an amenable number.

1005031421 is a deficient number, since it is larger than the sum of its proper divisors (19983619).

1005031421 is a wasteful number, since it uses less digits than its factorization.

1005031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18955.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1005031421 is about 31702.2305366673. The cubic root of 1005031421 is about 1001.6743353698.

Adding to 1005031421 its reverse (1241305001), we get a palindrome (2246336422).

The spelling of 1005031421 in words is "one billion, five million, thirty-one thousand, four hundred twenty-one".