161400671 has 4 divisors (see below), whose sum is σ = 161470512. Its totient is φ = 161330832.

The previous prime is 161400667. The next prime is 161400719. The reversal of 161400671 is 176004161.

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

It is a cyclic number.

It is not a de Polignac number, because 161400671 - 2² = 161400667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161400671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161400661) 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, 31331 + ... + 36116.

It is an arithmetic number, because the mean of its divisors is an integer number (40367628).

Almost surely, 2^161400671 is an apocalyptic number.

161400671 is a deficient number, since it is larger than the sum of its proper divisors (69841).

161400671 is an equidigital number, since it uses as much as digits as its factorization.

161400671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69840.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 161400671 is about 12704.3563788175. The cubic root of 161400671 is about 544.4630921452.

The spelling of 161400671 in words is "one hundred sixty-one million, four hundred thousand, six hundred seventy-one".