1118721077 has 2 divisors, whose sum is σ = 1118721078. Its totient is φ = 1118721076.

The previous prime is 1118721073. The next prime is 1118721113. The reversal of 1118721077 is 7701278111.

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., 685706596 + 433014481 = 26186^2 + 20809^2 .

It is an emirp because it is prime and its reverse (7701278111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1118721077 - 2² = 1118721073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118721073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559360538 + 559360539.

It is an arithmetic number, because the mean of its divisors is an integer number (559360539).

Almost surely, 2^1118721077 is an apocalyptic number.

It is an amenable number.

1118721077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118721077 is an equidigital number, since it uses as much as digits as its factorization.

1118721077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5488, while the sum is 35.

The square root of 1118721077 is about 33447.2880365509. The cubic root of 1118721077 is about 1038.1033840941.

Adding to 1118721077 its reverse (7701278111), we get a palindrome (8819999188).

The spelling of 1118721077 in words is "one billion, one hundred eighteen million, seven hundred twenty-one thousand, seventy-seven".