101621161 has 2 divisors, whose sum is σ = 101621162. Its totient is φ = 101621160.

The previous prime is 101621159. The next prime is 101621167. The reversal of 101621161 is 161126101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53582400 + 48038761 = 7320^2 + 6931^2 .

It is a cyclic number.

It is not a de Polignac number, because 101621161 - 2¹ = 101621159 is a prime.

Together with 101621159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (101621167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50810580 + 50810581.

It is an arithmetic number, because the mean of its divisors is an integer number (50810581).

Almost surely, 2^101621161 is an apocalyptic number.

It is an amenable number.

101621161 is a deficient number, since it is larger than the sum of its proper divisors (1).

101621161 is an equidigital number, since it uses as much as digits as its factorization.

101621161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 101621161 is about 10080.7321658697. The cubic root of 101621161 is about 466.6537041184.

Adding to 101621161 its reverse (161126101), we get a palindrome (262747262).

The spelling of 101621161 in words is "one hundred one million, six hundred twenty-one thousand, one hundred sixty-one".