1080400109 has 2 divisors, whose sum is σ = 1080400110. Its totient is φ = 1080400108.

The previous prime is 1080400019. The next prime is 1080400117. The reversal of 1080400109 is 9010040801.

Together with previous prime (1080400019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051186084 + 29214025 = 32422^2 + 5405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1080400109 is a prime.

It is a super-3 number, since 3×1080400109³ (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 (1080400159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540200054 + 540200055.

It is an arithmetic number, because the mean of its divisors is an integer number (540200055).

Almost surely, 2^1080400109 is an apocalyptic number.

It is an amenable number.

1080400109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1080400109 is an equidigital number, since it uses as much as digits as its factorization.

1080400109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1080400109 is about 32869.4403511833. The cubic root of 1080400109 is about 1026.1122517642.

The spelling of 1080400109 in words is "one billion, eighty million, four hundred thousand, one hundred nine".