1217552057 has 4 divisors (see below), whose sum is σ = 1219152756. Its totient is φ = 1215951360.

The previous prime is 1217552047. The next prime is 1217552059. The reversal of 1217552057 is 7502557121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7502557121 = 293 ⋅25605997.

It can be written as a sum of positive squares in 2 ways, for example, as 339259561 + 878292496 = 18419^2 + 29636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217552057 - 2⁴ = 1217552041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217552059) 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, 799208 + ... + 800729.

It is an arithmetic number, because the mean of its divisors is an integer number (304788189).

Almost surely, 2^1217552057 is an apocalyptic number.

It is an amenable number.

1217552057 is a deficient number, since it is larger than the sum of its proper divisors (1600699).

1217552057 is an equidigital number, since it uses as much as digits as its factorization.

1217552057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600698.

The product of its (nonzero) digits is 24500, while the sum is 35.

The square root of 1217552057 is about 34893.4385952431. The cubic root of 1217552057 is about 1067.8145795198.

The spelling of 1217552057 in words is "one billion, two hundred seventeen million, five hundred fifty-two thousand, fifty-seven".