1251201535045 has 48 divisors (see below), whose sum is σ = 1914385755456. Its totient is φ = 776272896000.

The previous prime is 1251201535027. The next prime is 1251201535081. The reversal of 1251201535045 is 5405351021521.

It is not a de Polignac number, because 1251201535045 - 2⁹ = 1251201534533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251201535045.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 531516 + ... + 1668805.

It is an arithmetic number, because the mean of its divisors is an integer number (39883036572).

Almost surely, 2^{1251201535045} is an apocalyptic number.

It is an amenable number.

1251201535045 is a deficient number, since it is larger than the sum of its proper divisors (663184220411).

1251201535045 is a wasteful number, since it uses less digits than its factorization.

1251201535045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200562 (or 2200555 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

Adding to 1251201535045 its reverse (5405351021521), we get a palindrome (6656552556566).

The spelling of 1251201535045 in words is "one trillion, two hundred fifty-one billion, two hundred one million, five hundred thirty-five thousand, forty-five".