1213998545 has 8 divisors (see below), whose sum is σ = 1457713320. Its totient is φ = 970588800.

The previous prime is 1213998523. The next prime is 1213998557. The reversal of 1213998545 is 5458993121.

It can be written as a sum of positive squares in 4 ways, for example, as 574465024 + 639533521 = 23968^2 + 25289^2 .

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

It is not a de Polignac number, because 1213998545 - 2⁶ = 1213998481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213998545.

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, 67406 + ... + 83495.

It is an arithmetic number, because the mean of its divisors is an integer number (182214165).

Almost surely, 2^1213998545 is an apocalyptic number.

It is an amenable number.

1213998545 is a deficient number, since it is larger than the sum of its proper divisors (243714775).

1213998545 is a wasteful number, since it uses less digits than its factorization.

1213998545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152515.

The product of its digits is 388800, while the sum is 47.

The square root of 1213998545 is about 34842.4819006913. The cubic root of 1213998545 is about 1066.7747363921.

The spelling of 1213998545 in words is "one billion, two hundred thirteen million, nine hundred ninety-eight thousand, five hundred forty-five".