19755121 has 2 divisors, whose sum is σ = 19755122. Its totient is φ = 19755120.

The previous prime is 19755101. The next prime is 19755133. The reversal of 19755121 is 12155791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 876096 = 4345^2 + 936^2 .

It is an emirp because it is prime and its reverse (12155791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19755121 - 2²³ = 11366513 is a prime.

It is not a weakly prime, because it can be changed into another prime (19755101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9877560 + 9877561.

It is an arithmetic number, because the mean of its divisors is an integer number (9877561).

Almost surely, 2^19755121 is an apocalyptic number.

It is an amenable number.

19755121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19755121 is an equidigital number, since it uses as much as digits as its factorization.

19755121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 31.

The square root of 19755121 is about 4444.6733288286. The cubic root of 19755121 is about 270.3293694195.

The spelling of 19755121 in words is "nineteen million, seven hundred fifty-five thousand, one hundred twenty-one".