161387961 has 8 divisors (see below), whose sum is σ = 245924544. Its totient is φ = 92221680.

The previous prime is 161387959. The next prime is 161387981. The reversal of 161387961 is 169783161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161387961 - 2¹ = 161387959 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161387981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3842550 + ... + 3842591.

It is an arithmetic number, because the mean of its divisors is an integer number (30740568).

Almost surely, 2^161387961 is an apocalyptic number.

It is an amenable number.

161387961 is a deficient number, since it is larger than the sum of its proper divisors (84536583).

161387961 is an equidigital number, since it uses as much as digits as its factorization.

161387961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685151.

The product of its digits is 54432, while the sum is 42.

The square root of 161387961 is about 12703.8561468556. The cubic root of 161387961 is about 544.4487999544.

The spelling of 161387961 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, nine hundred sixty-one".