31661041 has 4 divisors (see below), whose sum is σ = 33037632. Its totient is φ = 30284452.

The previous prime is 31661039. The next prime is 31661053. The reversal of 31661041 is 14016613.

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 a cyclic number.

It is not a de Polignac number, because 31661041 - 2¹ = 31661039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31661081) 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, 688261 + ... + 688306.

It is an arithmetic number, because the mean of its divisors is an integer number (8259408).

Almost surely, 2^31661041 is an apocalyptic number.

It is an amenable number.

31661041 is a deficient number, since it is larger than the sum of its proper divisors (1376591).

31661041 is a wasteful number, since it uses less digits than its factorization.

31661041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376590.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31661041 is about 5626.8144629088. The cubic root of 31661041 is about 316.3552626003.

Adding to 31661041 its reverse (14016613), we get a palindrome (45677654).

The spelling of 31661041 in words is "thirty-one million, six hundred sixty-one thousand, forty-one".