1211454545 has 8 divisors (see below), whose sum is σ = 1661423424. Its totient is φ = 830711664.

The previous prime is 1211454529. The next prime is 1211454557. The reversal of 1211454545 is 5454541121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1211454545 - 2⁴ = 1211454529 is a prime.

It is a super-3 number, since 3×1211454545³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17306459 + ... + 17306528.

It is an arithmetic number, because the mean of its divisors is an integer number (207677928).

Almost surely, 2^1211454545 is an apocalyptic number.

It is an amenable number.

1211454545 is a deficient number, since it is larger than the sum of its proper divisors (449968879).

1211454545 is an equidigital number, since it uses as much as digits as its factorization.

1211454545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34612999.

The product of its digits is 16000, while the sum is 32.

The square root of 1211454545 is about 34805.9555967079. The cubic root of 1211454545 is about 1066.0290537767.

Adding to 1211454545 its reverse (5454541121), we get a palindrome (6665995666).

The spelling of 1211454545 in words is "one billion, two hundred eleven million, four hundred fifty-four thousand, five hundred forty-five".