31133430 has 32 divisors (see below), whose sum is σ = 83023200. Its totient is φ = 8302176.

The previous prime is 31133321. The next prime is 31133437. The reversal of 31133430 is 3433113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57385 + ... + 57924.

It is an arithmetic number, because the mean of its divisors is an integer number (2594475).

Almost surely, 2^31133430 is an apocalyptic number.

31133430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31133430 is an abundant number, since it is smaller than the sum of its proper divisors (51889770).

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

31133430 is a wasteful number, since it uses less digits than its factorization.

31133430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115325 (or 115319 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 31133430 is about 5579.7338646211. The cubic root of 31133430 is about 314.5881238203.

Adding to 31133430 its reverse (3433113), we get a palindrome (34566543).

It can be divided in two parts, 311334 and 30, that added together give a square (311364 = 558²).

The spelling of 31133430 in words is "thirty-one million, one hundred thirty-three thousand, four hundred thirty".