30731045 has 8 divisors (see below), whose sum is σ = 36908160. Its totient is φ = 24564240.

The previous prime is 30731027. The next prime is 30731047. The reversal of 30731045 is 54013703.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-30731045 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30731045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30731047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7760 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (4613520).

Almost surely, 2^30731045 is an apocalyptic number.

It is an amenable number.

30731045 is a deficient number, since it is larger than the sum of its proper divisors (6177115).

30731045 is a wasteful number, since it uses less digits than its factorization.

30731045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 30731045 is about 5543.5588749467. The cubic root of 30731045 is about 313.2269412692.

Adding to 30731045 its reverse (54013703), we get a palindrome (84744748).

The spelling of 30731045 in words is "thirty million, seven hundred thirty-one thousand, forty-five".