31323142 has 4 divisors (see below), whose sum is σ = 46984716. Its totient is φ = 15661570.

The previous prime is 31323133. The next prime is 31323151. The reversal of 31323142 is 24132313.

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

It is an interprime number because it is at equal distance from previous prime (31323133) and next prime (31323151).

It is a super-3 number, since 3×31323142³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830784 + ... + 7830787.

It is an arithmetic number, because the mean of its divisors is an integer number (11746179).

Almost surely, 2^31323142 is an apocalyptic number.

31323142 is a deficient number, since it is larger than the sum of its proper divisors (15661574).

31323142 is a wasteful number, since it uses less digits than its factorization.

31323142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15661573.

The product of its digits is 432, while the sum is 19.

The square root of 31323142 is about 5596.7081396121. The cubic root of 31323142 is about 315.2258127207.

Adding to 31323142 its reverse (24132313), we get a palindrome (55455455).

The spelling of 31323142 in words is "thirty-one million, three hundred twenty-three thousand, one hundred forty-two".