103291621 has 2 divisors, whose sum is σ = 103291622. Its totient is φ = 103291620.

The previous prime is 103291613. The next prime is 103291627. The reversal of 103291621 is 126192301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102212100 + 1079521 = 10110^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 103291621 - 2³ = 103291613 is a prime.

It is equal to p_5940061 and since 103291621 and 5940061 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103291627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51645810 + 51645811.

It is an arithmetic number, because the mean of its divisors is an integer number (51645811).

Almost surely, 2^103291621 is an apocalyptic number.

It is an amenable number.

103291621 is a deficient number, since it is larger than the sum of its proper divisors (1).

103291621 is an equidigital number, since it uses as much as digits as its factorization.

103291621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 103291621 is about 10163.2485456177. The cubic root of 103291621 is about 469.1967886810.

The spelling of 103291621 in words is "one hundred three million, two hundred ninety-one thousand, six hundred twenty-one".