31741021 has 4 divisors (see below), whose sum is σ = 34182652. Its totient is φ = 29299392.

The previous prime is 31740979. The next prime is 31741033. The reversal of 31741021 is 12014713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 23872996 = 2805^2 + 4886^2 .

It is a cyclic number.

It is not a de Polignac number, because 31741021 - 2⁹ = 31740509 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 31741021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31741621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220796 + ... + 1220821.

It is an arithmetic number, because the mean of its divisors is an integer number (8545663).

Almost surely, 2^31741021 is an apocalyptic number.

It is an amenable number.

31741021 is a deficient number, since it is larger than the sum of its proper divisors (2441631).

31741021 is a wasteful number, since it uses less digits than its factorization.

31741021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441630.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31741021 is about 5633.9170210432. The cubic root of 31741021 is about 316.6214237610.

Adding to 31741021 its reverse (12014713), we get a palindrome (43755734).

The spelling of 31741021 in words is "thirty-one million, seven hundred forty-one thousand, twenty-one".