1220617501 has 2 divisors, whose sum is σ = 1220617502. Its totient is φ = 1220617500.

The previous prime is 1220617481. The next prime is 1220617537. The reversal of 1220617501 is 1057160221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722211876 + 498405625 = 26874^2 + 22325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220617501 - 2⁵ = 1220617469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220617001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610308750 + 610308751.

It is an arithmetic number, because the mean of its divisors is an integer number (610308751).

Almost surely, 2^1220617501 is an apocalyptic number.

It is an amenable number.

1220617501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220617501 is an equidigital number, since it uses as much as digits as its factorization.

1220617501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1220617501 is about 34937.3367760051. The cubic root of 1220617501 is about 1068.7099779320.

Adding to 1220617501 its reverse (1057160221), we get a palindrome (2277777722).

The spelling of 1220617501 in words is "one billion, two hundred twenty million, six hundred seventeen thousand, five hundred one".