172394987903 has 2 divisors, whose sum is σ = 172394987904. Its totient is φ = 172394987902.

The previous prime is 172394987879. The next prime is 172394987927. The reversal of 172394987903 is 309789493271.

It is a balanced prime because it is at equal distance from previous prime (172394987879) and next prime (172394987927).

It is a cyclic number.

It is not a de Polignac number, because 172394987903 - 2⁸ = 172394987647 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172394987983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86197493951 + 86197493952.

It is an arithmetic number, because the mean of its divisors is an integer number (86197493952).

Almost surely, 2^172394987903 is an apocalyptic number.

172394987903 is a deficient number, since it is larger than the sum of its proper divisors (1).

172394987903 is an equidigital number, since it uses as much as digits as its factorization.

172394987903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 172394987903 in words is "one hundred seventy-two billion, three hundred ninety-four million, nine hundred eighty-seven thousand, nine hundred three".