31109430 has 64 divisors (see below), whose sum is σ = 84105216. Its totient is φ = 7296000.

The previous prime is 31109411. The next prime is 31109437. The reversal of 31109430 is 3490113.

It is a junction number, because it is equal to n+sod(n) for n = 31109397 and 31109406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8710 + ... + 11750.

It is an arithmetic number, because the mean of its divisors is an integer number (1314144).

Almost surely, 2^31109430 is an apocalyptic number.

31109430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31109430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42052608).

31109430 is an abundant number, since it is smaller than the sum of its proper divisors (52995786).

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

31109430 is a wasteful number, since it uses less digits than its factorization.

31109430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31109430 is about 5577.5828097842. The cubic root of 31109430 is about 314.5072669421.

Adding to 31109430 its reverse (3490113), we get a palindrome (34599543).

The spelling of 31109430 in words is "thirty-one million, one hundred nine thousand, four hundred thirty".