1318198877 has 2 divisors, whose sum is σ = 1318198878. Its totient is φ = 1318198876.

The previous prime is 1318198867. The next prime is 1318198919. The reversal of 1318198877 is 7788918131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1111155556 + 207043321 = 33334^2 + 14389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318198877 - 2⁶ = 1318198813 is a prime.

It is a super-2 number, since 2×1318198877² = 3475296558648122258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318198867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659099438 + 659099439.

It is an arithmetic number, because the mean of its divisors is an integer number (659099439).

Almost surely, 2^1318198877 is an apocalyptic number.

It is an amenable number.

1318198877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318198877 is an equidigital number, since it uses as much as digits as its factorization.

1318198877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 53.

The square root of 1318198877 is about 36307.0086484690. The cubic root of 1318198877 is about 1096.4621535263.

The spelling of 1318198877 in words is "one billion, three hundred eighteen million, one hundred ninety-eight thousand, eight hundred seventy-seven".