101551621 has 2 divisors, whose sum is σ = 101551622. Its totient is φ = 101551620.

The previous prime is 101551607. The next prime is 101551627. The reversal of 101551621 is 126155101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80299521 + 21252100 = 8961^2 + 4610^2 .

It is an emirp because it is prime and its reverse (126155101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101551621 - 2¹¹ = 101549573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101551592 and 101551601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101551627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50775810 + 50775811.

It is an arithmetic number, because the mean of its divisors is an integer number (50775811).

Almost surely, 2^101551621 is an apocalyptic number.

It is an amenable number.

101551621 is a deficient number, since it is larger than the sum of its proper divisors (1).

101551621 is an equidigital number, since it uses as much as digits as its factorization.

101551621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 101551621 is about 10077.2824213674. The cubic root of 101551621 is about 466.5472351401.

The spelling of 101551621 in words is "one hundred one million, five hundred fifty-one thousand, six hundred twenty-one".