1201258557 has 12 divisors (see below), whose sum is σ = 1735809660. Its totient is φ = 800535168.

The previous prime is 1201258517. The next prime is 1201258567. The reversal of 1201258557 is 7558521021.

1201258557 is a `hidden beast` number, since 1 + 20 + 1 + 2 + 585 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 706018041 + 495240516 = 26571^2 + 22254^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1201258557 is a prime.

It is a super-3 number, since 3×1201258557³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201258507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1173 + ... + 49029.

It is an arithmetic number, because the mean of its divisors is an integer number (144650805).

Almost surely, 2^1201258557 is an apocalyptic number.

It is an amenable number.

1201258557 is a deficient number, since it is larger than the sum of its proper divisors (534551103).

1201258557 is a wasteful number, since it uses less digits than its factorization.

1201258557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50652 (or 50649 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 1201258557 is about 34659.1770964055. The cubic root of 1201258557 is about 1063.0299439308.

Adding to 1201258557 its reverse (7558521021), we get a palindrome (8759779578).

The spelling of 1201258557 in words is "one billion, two hundred one million, two hundred fifty-eight thousand, five hundred fifty-seven".