161383965 has 16 divisors (see below), whose sum is σ = 261484800. Its totient is φ = 84981312.

The previous prime is 161383933. The next prime is 161383969. The reversal of 161383965 is 569383161.

It is a happy number.

161383965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161383965 - 2⁵ = 161383933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161383969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66910 + ... + 69279.

It is an arithmetic number, because the mean of its divisors is an integer number (16342800).

Almost surely, 2^161383965 is an apocalyptic number.

161383965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161383965 is a deficient number, since it is larger than the sum of its proper divisors (100100835).

161383965 is a wasteful number, since it uses less digits than its factorization.

161383965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136276.

The product of its digits is 116640, while the sum is 42.

The square root of 161383965 is about 12703.6988708014. The cubic root of 161383965 is about 544.4443063615. Note that the first 3 decimals are identical.

It can be divided in two parts, 161 and 383965, that added together give a triangular number (384126 = T₈₇₆).

The spelling of 161383965 in words is "one hundred sixty-one million, three hundred eighty-three thousand, nine hundred sixty-five".