840561101 has 4 divisors (see below), whose sum is σ = 841693152. Its totient is φ = 839429052.

The previous prime is 840561097. The next prime is 840561103. The reversal of 840561101 is 101165048.

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.

It is a cyclic number.

It is not a de Polignac number, because 840561101 - 2² = 840561097 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 (840561103) 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, 564911 + ... + 566396.

It is an arithmetic number, because the mean of its divisors is an integer number (210423288).

Almost surely, 2^840561101 is an apocalyptic number.

It is an amenable number.

840561101 is a deficient number, since it is larger than the sum of its proper divisors (1132051).

840561101 is a wasteful number, since it uses less digits than its factorization.

840561101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132050.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 840561101 is about 28992.4317883133. The cubic root of 840561101 is about 943.7488368274.

The spelling of 840561101 in words is "eight hundred forty million, five hundred sixty-one thousand, one hundred one".