16201961 has 2 divisors, whose sum is σ = 16201962. Its totient is φ = 16201960.

The previous prime is 16201951. The next prime is 16201963. The reversal of 16201961 is 16910261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 6990736 = 3035^2 + 2644^2 .

It is an emirp because it is prime and its reverse (16910261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16201961 - 2⁶ = 16201897 is a prime.

Together with 16201963, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16201961.

It is not a weakly prime, because it can be changed into another prime (16201963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8100980 + 8100981.

It is an arithmetic number, because the mean of its divisors is an integer number (8100981).

Almost surely, 2^16201961 is an apocalyptic number.

It is an amenable number.

16201961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16201961 is an equidigital number, since it uses as much as digits as its factorization.

16201961 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16201961 is about 4025.1659593115. The cubic root of 16201961 is about 253.0400088789.

The spelling of 16201961 in words is "sixteen million, two hundred one thousand, nine hundred sixty-one".