31323145 has 8 divisors (see below), whose sum is σ = 42957504. Its totient is φ = 21478704.

The previous prime is 31323133. The next prime is 31323151. The reversal of 31323145 is 54132313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31323145 - 2¹³ = 31314953 is a prime.

It is a super-2 number, since 2×31323145² = 1962278825382050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447439 + ... + 447508.

It is an arithmetic number, because the mean of its divisors is an integer number (5369688).

Almost surely, 2^31323145 is an apocalyptic number.

31323145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31323145 is a deficient number, since it is larger than the sum of its proper divisors (11634359).

31323145 is an equidigital number, since it uses as much as digits as its factorization.

31323145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894959.

The product of its digits is 1080, while the sum is 22.

The square root of 31323145 is about 5596.7084076268. The cubic root of 31323145 is about 315.2258227843.

Adding to 31323145 its reverse (54132313), we get a palindrome (85455458).

It can be divided in two parts, 313231 and 45, that multiplied together give a triangular number (14095395 = T₅₃₀₉).

The spelling of 31323145 in words is "thirty-one million, three hundred twenty-three thousand, one hundred forty-five".