1223855957 has 2 divisors, whose sum is σ = 1223855958. Its totient is φ = 1223855956.

The previous prime is 1223855953. The next prime is 1223856001. The reversal of 1223855957 is 7595583221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1147922161 + 75933796 = 33881^2 + 8714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223855957 - 2² = 1223855953 is a prime.

It is a super-3 number, since 3×1223855957³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223855953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611927978 + 611927979.

It is an arithmetic number, because the mean of its divisors is an integer number (611927979).

Almost surely, 2^1223855957 is an apocalyptic number.

It is an amenable number.

1223855957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223855957 is an equidigital number, since it uses as much as digits as its factorization.

1223855957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 47.

The square root of 1223855957 is about 34983.6527109449. The cubic root of 1223855957 is about 1069.6542852028.

The spelling of 1223855957 in words is "one billion, two hundred twenty-three million, eight hundred fifty-five thousand, nine hundred fifty-seven".