31421696 has 18 divisors (see below), whose sum is σ = 62721162. Its totient is φ = 15710720.

The previous prime is 31421683. The next prime is 31421699. The reversal of 31421696 is 69612413.

It can be written as a sum of positive squares in only one way, i.e., 30647296 + 774400 = 5536^2 + 880^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421699) 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 as a sum of consecutive naturals, namely, 61115 + ... + 61626.

It is an arithmetic number, because the mean of its divisors is an integer number (3484509).

Almost surely, 2^31421696 is an apocalyptic number.

It is an amenable number.

31421696 is a deficient number, since it is larger than the sum of its proper divisors (31299466).

31421696 is an equidigital number, since it uses as much as digits as its factorization.

31421696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122757 (or 122743 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 31421696 is about 5605.5058647726. The cubic root of 31421696 is about 315.5560716193.

The spelling of 31421696 in words is "thirty-one million, four hundred twenty-one thousand, six hundred ninety-six".