19961601 has 16 divisors (see below), whose sum is σ = 29196288. Its totient is φ = 12030800.

The previous prime is 19961593. The next prime is 19961603. The reversal of 19961601 is 10616991.

It is a cyclic number.

It is not a de Polignac number, because 19961601 - 2³ = 19961593 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (19961603) 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, 4720 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (1824768).

Almost surely, 2^19961601 is an apocalyptic number.

19961601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19961601 is a deficient number, since it is larger than the sum of its proper divisors (9234687).

19961601 is a wasteful number, since it uses less digits than its factorization.

19961601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 19961601 is about 4467.8407536527. The cubic root of 19961601 is about 271.2679321606.

The spelling of 19961601 in words is "nineteen million, nine hundred sixty-one thousand, six hundred one".