1001272545 has 192 divisors, whose sum is σ = 2383879680. Its totient is φ = 376233984.

The previous prime is 1001272543. The next prime is 1001272549. The reversal of 1001272545 is 5452721001.

1001272545 is a `hidden beast` number, since 100 + 12 + 7 + 2 + 545 = 666.

It is not a de Polignac number, because 1001272545 - 2¹ = 1001272543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001272541) 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 191 ways as a sum of consecutive naturals, for example, 1322307 + ... + 1323063.

It is an arithmetic number, because the mean of its divisors is an integer number (12416040).

Almost surely, 2^1001272545 is an apocalyptic number.

1001272545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001272545 is an abundant number, since it is smaller than the sum of its proper divisors (1382607135).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001272545 is a wasteful number, since it uses less digits than its factorization.

1001272545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 1001272545 is about 31642.8909077537. The cubic root of 1001272545 is about 1000.4240018637.

Adding to 1001272545 its reverse (5452721001), we get a palindrome (6453993546).

The spelling of 1001272545 in words is "one billion, one million, two hundred seventy-two thousand, five hundred forty-five".