19970761 has 2 divisors, whose sum is σ = 19970762. Its totient is φ = 19970760.

The previous prime is 19970759. The next prime is 19970777. The reversal of 19970761 is 16707991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 2996361 = 4120^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 19970761 - 2¹ = 19970759 is a prime.

Together with 19970759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19970701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985380 + 9985381.

It is an arithmetic number, because the mean of its divisors is an integer number (9985381).

Almost surely, 2^19970761 is an apocalyptic number.

It is an amenable number.

19970761 is a deficient number, since it is larger than the sum of its proper divisors (1).

19970761 is an equidigital number, since it uses as much as digits as its factorization.

19970761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 19970761 is about 4468.8657397599. The cubic root of 19970761 is about 271.3094190513.

The spelling of 19970761 in words is "nineteen million, nine hundred seventy thousand, seven hundred sixty-one".