1217512801 has 2 divisors, whose sum is σ = 1217512802. Its totient is φ = 1217512800.

The previous prime is 1217512789. The next prime is 1217512819. The reversal of 1217512801 is 1082157121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736851025 + 480661776 = 27145^2 + 21924^2 .

It is an emirp because it is prime and its reverse (1082157121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217512801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217512801.

It is not a weakly prime, because it can be changed into another prime (1217512831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608756400 + 608756401.

It is an arithmetic number, because the mean of its divisors is an integer number (608756401).

Almost surely, 2^1217512801 is an apocalyptic number.

It is an amenable number.

1217512801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217512801 is an equidigital number, since it uses as much as digits as its factorization.

1217512801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 1217512801 is about 34892.8760780765. The cubic root of 1217512801 is about 1067.8031033288.

Adding to 1217512801 its reverse (1082157121), we get a palindrome (2299669922).

It can be divided in two parts, 12175 and 12801, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 1217512801 in words is "one billion, two hundred seventeen million, five hundred twelve thousand, eight hundred one".