161403977 has 8 divisors (see below), whose sum is σ = 185428992. Its totient is φ = 137620800.

The previous prime is 161403973. The next prime is 161404013. The reversal of 161403977 is 779304161.

161403977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161403977 - 2² = 161403973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161403977.

It is not an unprimeable number, because it can be changed into a prime (161403973) 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, 59024 + ... + 61697.

It is an arithmetic number, because the mean of its divisors is an integer number (23178624).

Almost surely, 2^161403977 is an apocalyptic number.

It is an amenable number.

161403977 is a deficient number, since it is larger than the sum of its proper divisors (24025015).

161403977 is a wasteful number, since it uses less digits than its factorization.

161403977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120919.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 161403977 is about 12704.4864909999. The cubic root of 161403977 is about 544.4668095661.

The spelling of 161403977 in words is "one hundred sixty-one million, four hundred three thousand, nine hundred seventy-seven".