102321409 has 2 divisors, whose sum is σ = 102321410. Its totient is φ = 102321408.

The previous prime is 102321379. The next prime is 102321433. The reversal of 102321409 is 904123201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87329025 + 14992384 = 9345^2 + 3872^2 .

It is an emirp because it is prime and its reverse (904123201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102321409 - 2¹³ = 102313217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102321409.

It is not a weakly prime, because it can be changed into another prime (102321469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51160704 + 51160705.

It is an arithmetic number, because the mean of its divisors is an integer number (51160705).

Almost surely, 2^102321409 is an apocalyptic number.

It is an amenable number.

102321409 is a deficient number, since it is larger than the sum of its proper divisors (1).

102321409 is an equidigital number, since it uses as much as digits as its factorization.

102321409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 102321409 is about 10115.4045396118. The cubic root of 102321409 is about 467.7231192113.

The spelling of 102321409 in words is "one hundred two million, three hundred twenty-one thousand, four hundred nine".