31772143 has 8 divisors (see below), whose sum is σ = 34289136. Its totient is φ = 29265600.

The previous prime is 31772107. The next prime is 31772173. The reversal of 31772143 is 34127713.

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

It is not a de Polignac number, because 31772143 - 2¹³ = 31763951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31772173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4428 + ... + 9118.

It is an arithmetic number, because the mean of its divisors is an integer number (4286142).

Almost surely, 2^31772143 is an apocalyptic number.

31772143 is a deficient number, since it is larger than the sum of its proper divisors (2516993).

31772143 is a wasteful number, since it uses less digits than its factorization.

31772143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225.

The product of its digits is 3528, while the sum is 28.

The square root of 31772143 is about 5636.6783658463. The cubic root of 31772143 is about 316.7248721570.

Adding to 31772143 its reverse (34127713), we get a palindrome (65899856).

The spelling of 31772143 in words is "thirty-one million, seven hundred seventy-two thousand, one hundred forty-three".