1223578877 has 2 divisors, whose sum is σ = 1223578878. Its totient is φ = 1223578876.

The previous prime is 1223578861. The next prime is 1223578913. The reversal of 1223578877 is 7788753221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155252121 + 68326756 = 33989^2 + 8266^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223578877 - 2⁴ = 1223578861 is a prime.

It is a super-2 number, since 2×1223578877² = 2994290536481162258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223575877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611789438 + 611789439.

It is an arithmetic number, because the mean of its divisors is an integer number (611789439).

Almost surely, 2^1223578877 is an apocalyptic number.

It is an amenable number.

1223578877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223578877 is an equidigital number, since it uses as much as digits as its factorization.

1223578877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 50.

The square root of 1223578877 is about 34979.6923514201. The cubic root of 1223578877 is about 1069.5735561549.

The spelling of 1223578877 in words is "one billion, two hundred twenty-three million, five hundred seventy-eight thousand, eight hundred seventy-seven".