1113721657 has 2 divisors, whose sum is σ = 1113721658. Its totient is φ = 1113721656.

The previous prime is 1113721649. The next prime is 1113721667. The reversal of 1113721657 is 7561273111.

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., 931714576 + 182007081 = 30524^2 + 13491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1113721657 - 2³ = 1113721649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1113721607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556860828 + 556860829.

It is an arithmetic number, because the mean of its divisors is an integer number (556860829).

Almost surely, 2^1113721657 is an apocalyptic number.

It is an amenable number.

1113721657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1113721657 is an equidigital number, since it uses as much as digits as its factorization.

1113721657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 34.

The square root of 1113721657 is about 33372.4685481910. The cubic root of 1113721657 is about 1036.5546915146.

Adding to 1113721657 its reverse (7561273111), we get a palindrome (8674994768).

The spelling of 1113721657 in words is "one billion, one hundred thirteen million, seven hundred twenty-one thousand, six hundred fifty-seven".