161863801 has 8 divisors (see below), whose sum is σ = 178200000. Its totient is φ = 145797840.

The previous prime is 161863787. The next prime is 161863813. The reversal of 161863801 is 108368161.

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 161863801 - 2⁵ = 161863769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161863301) 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, 66301 + ... + 68698.

It is an arithmetic number, because the mean of its divisors is an integer number (22275000).

Almost surely, 2^161863801 is an apocalyptic number.

161863801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161863801 is the 6801-st centered heptagonal number.

It is an amenable number.

161863801 is a deficient number, since it is larger than the sum of its proper divisors (16336199).

161863801 is a wasteful number, since it uses less digits than its factorization.

161863801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135119.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 161863801 is about 12722.5705342906. The cubic root of 161863801 is about 544.9833634065.

The spelling of 161863801 in words is "one hundred sixty-one million, eight hundred sixty-three thousand, eight hundred one".