161857041 has 4 divisors (see below), whose sum is σ = 215809392. Its totient is φ = 107904692.

The previous prime is 161856979. The next prime is 161857103. The reversal of 161857041 is 140758161.

It is a happy number.

161857041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (161856979) and next prime (161857103).

It is a cyclic number.

It is not a de Polignac number, because 161857041 - 2⁶ = 161856977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161856993 and 161857011.

It is not an unprimeable number, because it can be changed into a prime (161857841) 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, 26976171 + ... + 26976176.

It is an arithmetic number, because the mean of its divisors is an integer number (53952348).

Almost surely, 2^161857041 is an apocalyptic number.

It is an amenable number.

161857041 is a deficient number, since it is larger than the sum of its proper divisors (53952351).

161857041 is an equidigital number, since it uses as much as digits as its factorization.

161857041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53952350.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 161857041 is about 12722.3048619344. The cubic root of 161857041 is about 544.9757764954.

The spelling of 161857041 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, forty-one".