31132642 has 4 divisors (see below), whose sum is σ = 46698966. Its totient is φ = 15566320.

The previous prime is 31132601. The next prime is 31132643. The reversal of 31132642 is 24623113.

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

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 11498881 = 4431^2 + 3391^2 .

It is not an unprimeable number, because it can be changed into a prime (31132643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7783159 + ... + 7783162.

Almost surely, 2^31132642 is an apocalyptic number.

31132642 is a deficient number, since it is larger than the sum of its proper divisors (15566324).

31132642 is a wasteful number, since it uses less digits than its factorization.

31132642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15566323.

The product of its digits is 864, while the sum is 22.

The square root of 31132642 is about 5579.6632514875. The cubic root of 31132642 is about 314.5854696793.

Adding to 31132642 its reverse (24623113), we get a palindrome (55755755).

The spelling of 31132642 in words is "thirty-one million, one hundred thirty-two thousand, six hundred forty-two".