31446421 has 4 divisors (see below), whose sum is σ = 31507072. Its totient is φ = 31385772.

The previous prime is 31446367. The next prime is 31446427. The reversal of 31446421 is 12464413.

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 a cyclic number.

It is not a de Polignac number, because 31446421 - 2¹³ = 31438229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31446427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29541 + ... + 30586.

It is an arithmetic number, because the mean of its divisors is an integer number (7876768).

Almost surely, 2^31446421 is an apocalyptic number.

It is an amenable number.

31446421 is a deficient number, since it is larger than the sum of its proper divisors (60651).

31446421 is an equidigital number, since it uses as much as digits as its factorization.

31446421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60650.

The product of its digits is 2304, while the sum is 25.

The square root of 31446421 is about 5607.7108520322. The cubic root of 31446421 is about 315.6388178246.

The spelling of 31446421 in words is "thirty-one million, four hundred forty-six thousand, four hundred twenty-one".