19655081 has 2 divisors, whose sum is σ = 19655082. Its totient is φ = 19655080.

The previous prime is 19655059. The next prime is 19655093. The reversal of 19655081 is 18055691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10137856 + 9517225 = 3184^2 + 3085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19655081 is a prime.

It is a super-2 number, since 2×19655081² = 772644418233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19655021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9827540 + 9827541.

It is an arithmetic number, because the mean of its divisors is an integer number (9827541).

Almost surely, 2^19655081 is an apocalyptic number.

It is an amenable number.

19655081 is a deficient number, since it is larger than the sum of its proper divisors (1).

19655081 is an equidigital number, since it uses as much as digits as its factorization.

19655081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 19655081 is about 4433.4051247320. The cubic root of 19655081 is about 269.8722807004.

The spelling of 19655081 in words is "nineteen million, six hundred fifty-five thousand, eighty-one".