31681123 has 8 divisors (see below), whose sum is σ = 32279040. Its totient is φ = 31087560.

The previous prime is 31681103. The next prime is 31681127. The reversal of 31681123 is 32118613.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31681123 is a prime.

It is a super-2 number, since 2×31681123² = 2007387109082258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31681127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16036 + ... + 17902.

It is an arithmetic number, because the mean of its divisors is an integer number (4034880).

Almost surely, 2^31681123 is an apocalyptic number.

31681123 is a deficient number, since it is larger than the sum of its proper divisors (597917).

31681123 is a wasteful number, since it uses less digits than its factorization.

31681123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177.

The product of its digits is 864, while the sum is 25.

The square root of 31681123 is about 5628.5986710726. The cubic root of 31681123 is about 316.4221345187.

Adding to 31681123 its reverse (32118613), we get a palindrome (63799736).

It can be divided in two parts, 316811 and 23, that multiplied together give a triangular number (7286653 = T₃₈₁₇).

The spelling of 31681123 in words is "thirty-one million, six hundred eighty-one thousand, one hundred twenty-three".