172374555391 has 2 divisors, whose sum is σ = 172374555392. Its totient is φ = 172374555390.

The previous prime is 172374555313. The next prime is 172374555403. The reversal of 172374555391 is 193555473271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172374555391 - 2³¹ = 170227071743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172374555091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86187277695 + 86187277696.

It is an arithmetic number, because the mean of its divisors is an integer number (86187277696).

Almost surely, 2^172374555391 is an apocalyptic number.

172374555391 is a deficient number, since it is larger than the sum of its proper divisors (1).

172374555391 is an equidigital number, since it uses as much as digits as its factorization.

172374555391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969000, while the sum is 52.

The spelling of 172374555391 in words is "one hundred seventy-two billion, three hundred seventy-four million, five hundred fifty-five thousand, three hundred ninety-one".