1201355517 has 4 divisors (see below), whose sum is σ = 1601807360. Its totient is φ = 800903676.

The previous prime is 1201355501. The next prime is 1201355521. The reversal of 1201355517 is 7155531021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1201355517 - 2⁴ = 1201355501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201355557) 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, 200225917 + ... + 200225922.

It is an arithmetic number, because the mean of its divisors is an integer number (400451840).

Almost surely, 2^1201355517 is an apocalyptic number.

It is an amenable number.

1201355517 is a deficient number, since it is larger than the sum of its proper divisors (400451843).

1201355517 is an equidigital number, since it uses as much as digits as its factorization.

1201355517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400451842.

The product of its (nonzero) digits is 5250, while the sum is 30.

The square root of 1201355517 is about 34660.5758319160. The cubic root of 1201355517 is about 1063.0585441045.

Adding to 1201355517 its reverse (7155531021), we get a palindrome (8356886538).

The spelling of 1201355517 in words is "one billion, two hundred one million, three hundred fifty-five thousand, five hundred seventeen".