1205052451 has 4 divisors (see below), whose sum is σ = 1209165552. Its totient is φ = 1200939352.

The previous prime is 1205052449. The next prime is 1205052469. The reversal of 1205052451 is 1542505021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1542505021 = 67 ⋅23022463.

It is a cyclic number.

It is not a de Polignac number, because 1205052451 - 2¹ = 1205052449 is a prime.

It is a super-2 number, since 2×1205052451² = 2904302819322214802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205052421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056111 + ... + 2056696.

It is an arithmetic number, because the mean of its divisors is an integer number (302291388).

Almost surely, 2^1205052451 is an apocalyptic number.

1205052451 is a deficient number, since it is larger than the sum of its proper divisors (4113101).

1205052451 is an equidigital number, since it uses as much as digits as its factorization.

1205052451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113100.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1205052451 is about 34713.8653998658. The cubic root of 1205052451 is about 1064.1478782701.

Adding to 1205052451 its reverse (1542505021), we get a palindrome (2747557472).

The spelling of 1205052451 in words is "one billion, two hundred five million, fifty-two thousand, four hundred fifty-one".