19621061 has 2 divisors, whose sum is σ = 19621062. Its totient is φ = 19621060.

The previous prime is 19621057. The next prime is 19621067. The reversal of 19621061 is 16012691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19088161 + 532900 = 4369^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 19621061 - 2² = 19621057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19621061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19621067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810530 + 9810531.

It is an arithmetic number, because the mean of its divisors is an integer number (9810531).

Almost surely, 2^19621061 is an apocalyptic number.

It is an amenable number.

19621061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621061 is an equidigital number, since it uses as much as digits as its factorization.

19621061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 19621061 is about 4429.5666830967. The cubic root of 19621061 is about 269.7164879549.

The spelling of 19621061 in words is "nineteen million, six hundred twenty-one thousand, sixty-one".