19407961 has 2 divisors, whose sum is σ = 19407962. Its totient is φ = 19407960.

The previous prime is 19407959. The next prime is 19407977. The reversal of 19407961 is 16970491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19360000 + 47961 = 4400^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 19407961 - 2¹ = 19407959 is a prime.

Together with 19407959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19407961.

It is not a weakly prime, because it can be changed into another prime (19407901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703980 + 9703981.

It is an arithmetic number, because the mean of its divisors is an integer number (9703981).

Almost surely, 2^19407961 is an apocalyptic number.

It is an amenable number.

19407961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19407961 is an equidigital number, since it uses as much as digits as its factorization.

19407961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 19407961 is about 4405.4467423861. The cubic root of 19407961 is about 268.7364878009.

The spelling of 19407961 in words is "nineteen million, four hundred seven thousand, nine hundred sixty-one".