31320190 has 16 divisors (see below), whose sum is σ = 61501680. Its totient is φ = 11389120.

The previous prime is 31320173. The next prime is 31320193. The reversal of 31320190 is 9102313.

It is a super-2 number, since 2×31320190² = 1961908603272200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320193) 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 7 ways as a sum of consecutive naturals, for example, 142255 + ... + 142474.

It is an arithmetic number, because the mean of its divisors is an integer number (3843855).

Almost surely, 2^31320190 is an apocalyptic number.

31320190 is a deficient number, since it is larger than the sum of its proper divisors (30181490).

31320190 is a wasteful number, since it uses less digits than its factorization.

31320190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284747.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 31320190 is about 5596.4444069427. Note that the first 4 decimals coincide. The cubic root of 31320190 is about 315.2159097568.

It can be divided in two parts, 313 and 20190, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 31320190 in words is "thirty-one million, three hundred twenty thousand, one hundred ninety".