102251605 has 4 divisors (see below), whose sum is σ = 122701932. Its totient is φ = 81801280.

The previous prime is 102251603. The next prime is 102251621. The reversal of 102251605 is 506152201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17648401 + 84603204 = 4201^2 + 9198^2 .

It is not a de Polignac number, because 102251605 - 2¹ = 102251603 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102251603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10225156 + ... + 10225165.

It is an arithmetic number, because the mean of its divisors is an integer number (30675483).

Almost surely, 2^102251605 is an apocalyptic number.

It is an amenable number.

102251605 is a deficient number, since it is larger than the sum of its proper divisors (20450327).

102251605 is an equidigital number, since it uses as much as digits as its factorization.

102251605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20450326.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 102251605 is about 10111.9535699092. The cubic root of 102251605 is about 467.6167342682.

The spelling of 102251605 in words is "one hundred two million, two hundred fifty-one thousand, six hundred five".