161401871 has 4 divisors (see below), whose sum is σ = 165338544. Its totient is φ = 157465200.

The previous prime is 161401853. The next prime is 161401897. The reversal of 161401871 is 178104161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161401871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161401811) 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, 1968275 + ... + 1968356.

It is an arithmetic number, because the mean of its divisors is an integer number (41334636).

Almost surely, 2^161401871 is an apocalyptic number.

161401871 is a deficient number, since it is larger than the sum of its proper divisors (3936673).

161401871 is an equidigital number, since it uses as much as digits as its factorization.

161401871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936672.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 161401871 is about 12704.4036066240. The cubic root of 161401871 is about 544.4644414871.

The spelling of 161401871 in words is "one hundred sixty-one million, four hundred one thousand, eight hundred seventy-one".