19730551 has 2 divisors, whose sum is σ = 19730552. Its totient is φ = 19730550.

The previous prime is 19730537. The next prime is 19730563. The reversal of 19730551 is 15503791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19730551 - 2⁵ = 19730519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19730521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9865275 + 9865276.

It is an arithmetic number, because the mean of its divisors is an integer number (9865276).

Almost surely, 2^19730551 is an apocalyptic number.

19730551 is a deficient number, since it is larger than the sum of its proper divisors (1).

19730551 is an equidigital number, since it uses as much as digits as its factorization.

19730551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 19730551 is about 4441.9084862253. The cubic root of 19730551 is about 270.2172508433.

The spelling of 19730551 in words is "nineteen million, seven hundred thirty thousand, five hundred fifty-one".