102145405 has 4 divisors (see below), whose sum is σ = 122574492. Its totient is φ = 81716320.

The previous prime is 102145331. The next prime is 102145451. The reversal of 102145405 is 504541201.

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 51294244 + 50851161 = 7162^2 + 7131^2 .

It is not a de Polignac number, because 102145405 - 2¹³ = 102137213 is a prime.

It is a super-2 number, since 2×102145405² = 20867367525228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10214536 + ... + 10214545.

It is an arithmetic number, because the mean of its divisors is an integer number (30643623).

Almost surely, 2^102145405 is an apocalyptic number.

It is an amenable number.

102145405 is a deficient number, since it is larger than the sum of its proper divisors (20429087).

102145405 is an equidigital number, since it uses as much as digits as its factorization.

102145405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20429086.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 102145405 is about 10106.7009948845. The cubic root of 102145405 is about 467.4547870141.

Adding to 102145405 its reverse (504541201), we get a palindrome (606686606).

The spelling of 102145405 in words is "one hundred two million, one hundred forty-five thousand, four hundred five".