1201266145 has 4 divisors (see below), whose sum is σ = 1441519380. Its totient is φ = 961012912.

The previous prime is 1201266113. The next prime is 1201266163. The reversal of 1201266145 is 5416621021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5416621021 = 7 ⋅773803003.

It can be written as a sum of positive squares in 2 ways, for example, as 840304144 + 360962001 = 28988^2 + 18999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201266145 - 2⁵ = 1201266113 is a prime.

It is a super-2 number, since 2×1201266145² = 2886080702246322050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120126610 + ... + 120126619.

It is an arithmetic number, because the mean of its divisors is an integer number (360379845).

Almost surely, 2^1201266145 is an apocalyptic number.

It is an amenable number.

1201266145 is a deficient number, since it is larger than the sum of its proper divisors (240253235).

1201266145 is an equidigital number, since it uses as much as digits as its factorization.

1201266145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240253234.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1201266145 is about 34659.2865621899. The cubic root of 1201266145 is about 1063.0321822095.

Adding to 1201266145 its reverse (5416621021), we get a palindrome (6617887166).

The spelling of 1201266145 in words is "one billion, two hundred one million, two hundred sixty-six thousand, one hundred forty-five".