31421001 has 4 divisors (see below), whose sum is σ = 41894672. Its totient is φ = 20947332.

The previous prime is 31420969. The next prime is 31421009. The reversal of 31421001 is 10012413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31421001 - 2⁵ = 31420969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5236831 + ... + 5236836.

It is an arithmetic number, because the mean of its divisors is an integer number (10473668).

Almost surely, 2^31421001 is an apocalyptic number.

It is an amenable number.

31421001 is a deficient number, since it is larger than the sum of its proper divisors (10473671).

31421001 is a wasteful number, since it uses less digits than its factorization.

31421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473670.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31421001 is about 5605.4438718089. The cubic root of 31421001 is about 315.5537450624.

Adding to 31421001 its reverse (10012413), we get a palindrome (41433414).

The spelling of 31421001 in words is "thirty-one million, four hundred twenty-one thousand, one".