171391953 has 4 divisors (see below), whose sum is σ = 228522608. Its totient is φ = 114261300.

The previous prime is 171391949. The next prime is 171391973. The reversal of 171391953 is 359193171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 171391953 - 2² = 171391949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (171391973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28565323 + ... + 28565328.

It is an arithmetic number, because the mean of its divisors is an integer number (57130652).

Almost surely, 2^171391953 is an apocalyptic number.

It is an amenable number.

171391953 is a deficient number, since it is larger than the sum of its proper divisors (57130655).

171391953 is an equidigital number, since it uses as much as digits as its factorization.

171391953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57130654.

The product of its digits is 25515, while the sum is 39.

The square root of 171391953 is about 13091.6749501353. The cubic root of 171391953 is about 555.4736675408.

The spelling of 171391953 in words is "one hundred seventy-one million, three hundred ninety-one thousand, nine hundred fifty-three".