19961057 has 4 divisors (see below), whose sum is σ = 20299440. Its totient is φ = 19622676.

The previous prime is 19961023. The next prime is 19961059. The reversal of 19961057 is 75016991.

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 19961057 - 2¹² = 19956961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19961057.

It is not an unprimeable number, because it can be changed into a prime (19961059) 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, 169103 + ... + 169220.

It is an arithmetic number, because the mean of its divisors is an integer number (5074860).

Almost surely, 2^19961057 is an apocalyptic number.

It is an amenable number.

19961057 is a deficient number, since it is larger than the sum of its proper divisors (338383).

19961057 is an equidigital number, since it uses as much as digits as its factorization.

19961057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338382.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 19961057 is about 4467.7798737180. The cubic root of 19961057 is about 271.2654679111.

The spelling of 19961057 in words is "nineteen million, nine hundred sixty-one thousand, fifty-seven".