1210638545 has 4 divisors (see below), whose sum is σ = 1452766260. Its totient is φ = 968510832.

The previous prime is 1210638521. The next prime is 1210638577. The reversal of 1210638545 is 5458360121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5458360121 = 89 ⋅61329889.

It can be written as a sum of positive squares in 2 ways, for example, as 465566929 + 745071616 = 21577^2 + 27296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210638545 - 2²² = 1206444241 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121063850 + ... + 121063859.

It is an arithmetic number, because the mean of its divisors is an integer number (363191565).

Almost surely, 2^1210638545 is an apocalyptic number.

It is an amenable number.

1210638545 is a deficient number, since it is larger than the sum of its proper divisors (242127715).

1210638545 is an equidigital number, since it uses as much as digits as its factorization.

1210638545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242127714.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1210638545 is about 34794.2314902916. The cubic root of 1210638545 is about 1065.7896514558.

Adding to 1210638545 its reverse (5458360121), we get a palindrome (6668998666).

The spelling of 1210638545 in words is "one billion, two hundred ten million, six hundred thirty-eight thousand, five hundred forty-five".