1205145451 has 4 divisors (see below), whose sum is σ = 1206306400. Its totient is φ = 1203984504.

The previous prime is 1205145439. The next prime is 1205145479. The reversal of 1205145451 is 1545415021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1545415021 = 1483 ⋅1042087.

It is a cyclic number.

It is not a de Polignac number, because 1205145451 - 2¹⁵ = 1205112683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205143451) 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, 578916 + ... + 580993.

It is an arithmetic number, because the mean of its divisors is an integer number (301576600).

Almost surely, 2^1205145451 is an apocalyptic number.

1205145451 is a deficient number, since it is larger than the sum of its proper divisors (1160949).

1205145451 is a wasteful number, since it uses less digits than its factorization.

1205145451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160948.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 1205145451 is about 34715.2048964139. The cubic root of 1205145451 is about 1064.1752527928.

The spelling of 1205145451 in words is "one billion, two hundred five million, one hundred forty-five thousand, four hundred fifty-one".