1100400061 has 4 divisors (see below), whose sum is σ = 1100836000. Its totient is φ = 1099964124.

The previous prime is 1100400053. The next prime is 1100400071. The reversal of 1100400061 is 1600040011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1600040011 = 23 ⋅69566957.

It is a cyclic number.

It is not a de Polignac number, because 1100400061 - 2³ = 1100400053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100400011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214161 + ... + 219238.

It is an arithmetic number, because the mean of its divisors is an integer number (275209000).

Almost surely, 2^1100400061 is an apocalyptic number.

It is an amenable number.

1100400061 is a deficient number, since it is larger than the sum of its proper divisors (435939).

1100400061 is an equidigital number, since it uses as much as digits as its factorization.

1100400061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435938.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1100400061 is about 33172.2785017852. The cubic root of 1100400061 is about 1032.4052442322.

Adding to 1100400061 its reverse (1600040011), we get a palindrome (2700440072).

The spelling of 1100400061 in words is "one billion, one hundred million, four hundred thousand, sixty-one".