171622042 has 4 divisors (see below), whose sum is σ = 257433066. Its totient is φ = 85811020.

The previous prime is 171622037. The next prime is 171622043. The reversal of 171622042 is 240226171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240226171 = 157 ⋅1530103.

It can be written as a sum of positive squares in only one way, i.e., 151019521 + 20602521 = 12289^2 + 4539^2 .

It is a junction number, because it is equal to n+sod(n) for n = 171621998 and 171622016.

It is not an unprimeable number, because it can be changed into a prime (171622043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905509 + ... + 42905512.

Almost surely, 2^171622042 is an apocalyptic number.

171622042 is a deficient number, since it is larger than the sum of its proper divisors (85811024).

171622042 is an equidigital number, since it uses as much as digits as its factorization.

171622042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85811023.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 171622042 is about 13100.4596102580. The cubic root of 171622042 is about 555.7221257832.

The spelling of 171622042 in words is "one hundred seventy-one million, six hundred twenty-two thousand, forty-two".