100402161 has 4 divisors (see below), whose sum is σ = 133869552. Its totient is φ = 66934772.

The previous prime is 100402151. The next prime is 100402163. The reversal of 100402161 is 161204001.

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 not a de Polignac number, because 100402161 - 2⁹ = 100401649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100402161.

It is not an unprimeable number, because it can be changed into a prime (100402163) 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, 16733691 + ... + 16733696.

It is an arithmetic number, because the mean of its divisors is an integer number (33467388).

Almost surely, 2^100402161 is an apocalyptic number.

It is an amenable number.

100402161 is a deficient number, since it is larger than the sum of its proper divisors (33467391).

100402161 is an equidigital number, since it uses as much as digits as its factorization.

100402161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33467390.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 100402161 is about 10020.0878738662. The cubic root of 100402161 is about 464.7802731108.

Adding to 100402161 its reverse (161204001), we get a palindrome (261606162).

The spelling of 100402161 in words is "one hundred million, four hundred two thousand, one hundred sixty-one".