31143907 has 4 divisors (see below), whose sum is σ = 32783080. Its totient is φ = 29504736.

The previous prime is 31143877. The next prime is 31143919. The reversal of 31143907 is 70934113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70934113 = 2687 ⋅26399.

It is a cyclic number.

It is not a de Polignac number, because 31143907 - 2¹⁹ = 30619619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143947) 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 3 ways as a sum of consecutive naturals, for example, 819558 + ... + 819595.

It is an arithmetic number, because the mean of its divisors is an integer number (8195770).

Almost surely, 2^31143907 is an apocalyptic number.

31143907 is a deficient number, since it is larger than the sum of its proper divisors (1639173).

31143907 is a wasteful number, since it uses less digits than its factorization.

31143907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639172.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31143907 is about 5580.6726297105. The cubic root of 31143907 is about 314.6234081874.

It can be divided in two parts, 3114 and 3907, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 31143907 in words is "thirty-one million, one hundred forty-three thousand, nine hundred seven".