31145430 has 32 divisors (see below), whose sum is σ = 74906208. Its totient is φ = 8288000.

The previous prime is 31145423. The next prime is 31145431. The reversal of 31145430 is 3454113.

It is a junction number, because it is equal to n+sod(n) for n = 31145397 and 31145406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31145431) 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 15 ways as a sum of consecutive naturals, for example, 20290 + ... + 21770.

It is an arithmetic number, because the mean of its divisors is an integer number (2340819).

Almost surely, 2^31145430 is an apocalyptic number.

31145430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31145430 is an abundant number, since it is smaller than the sum of its proper divisors (43760778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31145430 is a wasteful number, since it uses less digits than its factorization.

31145430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31145430 is about 5580.8090811279. The cubic root of 31145430 is about 314.6285366774.

Adding to 31145430 its reverse (3454113), we get a palindrome (34599543).

The spelling of 31145430 in words is "thirty-one million, one hundred forty-five thousand, four hundred thirty".