193920953 has 2 divisors, whose sum is σ = 193920954. Its totient is φ = 193920952.

The previous prime is 193920949. The next prime is 193920971. The reversal of 193920953 is 359029391.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118091689 + 75829264 = 10867^2 + 8708^2 .

It is a cyclic number.

It is not a de Polignac number, because 193920953 - 2² = 193920949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 193920953.

It is not a weakly prime, because it can be changed into another prime (193920983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96960476 + 96960477.

It is an arithmetic number, because the mean of its divisors is an integer number (96960477).

Almost surely, 2^193920953 is an apocalyptic number.

It is an amenable number.

193920953 is a deficient number, since it is larger than the sum of its proper divisors (1).

193920953 is an equidigital number, since it uses as much as digits as its factorization.

193920953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 193920953 is about 13925.5503661435. The cubic root of 193920953 is about 578.8174011039.

The spelling of 193920953 in words is "one hundred ninety-three million, nine hundred twenty thousand, nine hundred fifty-three".