31385043 has 32 divisors (see below), whose sum is σ = 49792320. Its totient is φ = 19468800.

The previous prime is 31385023. The next prime is 31385059. The reversal of 31385043 is 34058313.

It is a happy number.

It is not a de Polignac number, because 31385043 - 2⁹ = 31384531 is a prime.

It is a super-2 number, since 2×31385043² = 1970041848223698, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31384998 and 31385016.

It is not an unprimeable number, because it can be changed into a prime (31385023) 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 31 ways as a sum of consecutive naturals, for example, 46021 + ... + 46697.

It is an arithmetic number, because the mean of its divisors is an integer number (1556010).

Almost surely, 2^31385043 is an apocalyptic number.

31385043 is a deficient number, since it is larger than the sum of its proper divisors (18407277).

31385043 is a wasteful number, since it uses less digits than its factorization.

31385043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 31385043 is about 5602.2355359267. The cubic root of 31385043 is about 315.4333265279.

The spelling of 31385043 in words is "thirty-one million, three hundred eighty-five thousand, forty-three".