31042145 has 8 divisors (see below), whose sum is σ = 37523304. Its totient is φ = 24651904.

The previous prime is 31042133. The next prime is 31042159. The reversal of 31042145 is 54124013.

It can be written as a sum of positive squares in 4 ways, for example, as 2729104 + 28313041 = 1652^2 + 5321^2 .

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 31042145 - 2⁸ = 31041889 is a prime.

It is a super-2 number, since 2×31042145² = 1927229532402050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21974 + ... + 23343.

It is an arithmetic number, because the mean of its divisors is an integer number (4690413).

Almost surely, 2^31042145 is an apocalyptic number.

It is an amenable number.

31042145 is a deficient number, since it is larger than the sum of its proper divisors (6481159).

31042145 is a wasteful number, since it uses less digits than its factorization.

31042145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45459.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 31042145 is about 5571.5478100793. The cubic root of 31042145 is about 314.2803593637.

Adding to 31042145 its reverse (54124013), we get a palindrome (85166158).

The spelling of 31042145 in words is "thirty-one million, forty-two thousand, one hundred forty-five".