161489077 has 4 divisors (see below), whose sum is σ = 164226240. Its totient is φ = 158751916.

The previous prime is 161489057. The next prime is 161489087. The reversal of 161489077 is 770984161.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161489077 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 (161489017) 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, 1368493 + ... + 1368610.

It is an arithmetic number, because the mean of its divisors is an integer number (41056560).

Almost surely, 2^161489077 is an apocalyptic number.

It is an amenable number.

161489077 is a deficient number, since it is larger than the sum of its proper divisors (2737163).

161489077 is an equidigital number, since it uses as much as digits as its factorization.

161489077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737162.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 161489077 is about 12707.8352601850. The cubic root of 161489077 is about 544.5624825178.

The spelling of 161489077 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, seventy-seven".