1220502257 has 8 divisors (see below), whose sum is σ = 1332393384. Its totient is φ = 1111183488.

The previous prime is 1220502253. The next prime is 1220502287. The reversal of 1220502257 is 7522050221.

It can be written as a sum of positive squares in 4 ways, for example, as 264517696 + 955984561 = 16264^2 + 30919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220502257 - 2² = 1220502253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220502253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642098 + ... + 643995.

It is an arithmetic number, because the mean of its divisors is an integer number (166549173).

Almost surely, 2^1220502257 is an apocalyptic number.

It is an amenable number.

1220502257 is a deficient number, since it is larger than the sum of its proper divisors (111891127).

1220502257 is a wasteful number, since it uses less digits than its factorization.

1220502257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286179.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 1220502257 is about 34935.6874413543. The cubic root of 1220502257 is about 1068.6763429648.

Adding to 1220502257 its reverse (7522050221), we get a palindrome (8742552478).

The spelling of 1220502257 in words is "one billion, two hundred twenty million, five hundred two thousand, two hundred fifty-seven".