31681045 has 8 divisors (see below), whose sum is σ = 41473440. Its totient is φ = 23040720.

The previous prime is 31681043. The next prime is 31681057. The reversal of 31681045 is 54018613.

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

It is not a de Polignac number, because 31681045 - 2¹ = 31681043 is a prime.

It is a super-2 number, since 2×31681045² = 2007377224584050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31681043) 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 7 ways as a sum of consecutive naturals, for example, 287955 + ... + 288064.

It is an arithmetic number, because the mean of its divisors is an integer number (5184180).

Almost surely, 2^31681045 is an apocalyptic number.

It is an amenable number.

31681045 is a deficient number, since it is larger than the sum of its proper divisors (9792395).

31681045 is a wasteful number, since it uses less digits than its factorization.

31681045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576035.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 31681045 is about 5628.5917421678. The cubic root of 31681045 is about 316.4218748378.

Adding to 31681045 its reverse (54018613), we get a palindrome (85699658).

The spelling of 31681045 in words is "thirty-one million, six hundred eighty-one thousand, forty-five".