19713961 has 2 divisors, whose sum is σ = 19713962. Its totient is φ = 19713960.

The previous prime is 19713949. The next prime is 19714003. The reversal of 19713961 is 16931791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 361 = 4440^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 19713961 - 2⁵ = 19713929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19713961.

It is not a weakly prime, because it can be changed into another prime (19711961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856980 + 9856981.

It is an arithmetic number, because the mean of its divisors is an integer number (9856981).

Almost surely, 2^19713961 is an apocalyptic number.

It is an amenable number.

19713961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713961 is an equidigital number, since it uses as much as digits as its factorization.

19713961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 19713961 is about 4440.0406529670. The cubic root of 19713961 is about 270.1414941951.

The spelling of 19713961 in words is "nineteen million, seven hundred thirteen thousand, nine hundred sixty-one".