172641600091 has 2 divisors, whose sum is σ = 172641600092. Its totient is φ = 172641600090.

The previous prime is 172641600037. The next prime is 172641600107. The reversal of 172641600091 is 190006146271.

It is a strong prime.

It is an emirp because it is prime and its reverse (190006146271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172641600091 - 2²¹ = 172639502939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172641600091.

It is not a weakly prime, because it can be changed into another prime (172641600191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86320800045 + 86320800046.

It is an arithmetic number, because the mean of its divisors is an integer number (86320800046).

Almost surely, 2^172641600091 is an apocalyptic number.

172641600091 is a deficient number, since it is larger than the sum of its proper divisors (1).

172641600091 is an equidigital number, since it uses as much as digits as its factorization.

172641600091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 172641600091 in words is "one hundred seventy-two billion, six hundred forty-one million, six hundred thousand, ninety-one".