561991701 has 16 divisors (see below), whose sum is σ = 773141760. Its totient is φ = 362930880.

The previous prime is 561991699. The next prime is 561991751. The reversal of 561991701 is 107199165.

It is not a de Polignac number, because 561991701 - 2¹ = 561991699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561991701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561991751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9810 + ... + 34931.

It is an arithmetic number, because the mean of its divisors is an integer number (48321360).

Almost surely, 2^561991701 is an apocalyptic number.

It is an amenable number.

561991701 is a deficient number, since it is larger than the sum of its proper divisors (211150059).

561991701 is a wasteful number, since it uses less digits than its factorization.

561991701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44876.

The product of its (nonzero) digits is 17010, while the sum is 39.

The square root of 561991701 is about 23706.3641455201. The cubic root of 561991701 is about 825.2330904280.

The spelling of 561991701 in words is "five hundred sixty-one million, nine hundred ninety-one thousand, seven hundred one".