31530045 has 16 divisors (see below), whose sum is σ = 50650560. Its totient is φ = 16748544.

The previous prime is 31530043. The next prime is 31530061. The reversal of 31530045 is 54003513.

It is not a de Polignac number, because 31530045 - 2¹ = 31530043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530043) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 235 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (3165660).

Almost surely, 2^31530045 is an apocalyptic number.

It is an amenable number.

31530045 is a deficient number, since it is larger than the sum of its proper divisors (19120515).

31530045 is a wasteful number, since it uses less digits than its factorization.

31530045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8444.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 31530045 is about 5615.1620635561. The cubic root of 31530045 is about 315.9183580414.

Adding to 31530045 its reverse (54003513), we get a palindrome (85533558).

The spelling of 31530045 in words is "thirty-one million, five hundred thirty thousand, forty-five".