102124381 has 2 divisors, whose sum is σ = 102124382. Its totient is φ = 102124380.

The previous prime is 102124369. The next prime is 102124409. The reversal of 102124381 is 183421201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101183481 + 940900 = 10059^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102124381 is a prime.

It is a super-2 number, since 2×102124381² = 20858778389266322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102124361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51062190 + 51062191.

It is an arithmetic number, because the mean of its divisors is an integer number (51062191).

Almost surely, 2^102124381 is an apocalyptic number.

It is an amenable number.

102124381 is a deficient number, since it is larger than the sum of its proper divisors (1).

102124381 is an equidigital number, since it uses as much as digits as its factorization.

102124381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 102124381 is about 10105.6608393514. The cubic root of 102124381 is about 467.4227136387.

Adding to 102124381 its reverse (183421201), we get a palindrome (285545582).

The spelling of 102124381 in words is "one hundred two million, one hundred twenty-four thousand, three hundred eighty-one".