102255145 has 4 divisors (see below), whose sum is σ = 122706180. Its totient is φ = 81804112.

The previous prime is 102255137. The next prime is 102255157. The reversal of 102255145 is 541552201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541552201 = 139 ⋅3896059.

It can be written as a sum of positive squares in 2 ways, for example, as 37307664 + 64947481 = 6108^2 + 8059^2 .

It is a cyclic number.

It is not a de Polignac number, because 102255145 - 2³ = 102255137 is a prime.

It is a super-2 number, since 2×102255145² = 20912229357942050, which contains 22 as substring.

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, 10225510 + ... + 10225519.

It is an arithmetic number, because the mean of its divisors is an integer number (30676545).

Almost surely, 2^102255145 is an apocalyptic number.

It is an amenable number.

102255145 is a deficient number, since it is larger than the sum of its proper divisors (20451035).

102255145 is an equidigital number, since it uses as much as digits as its factorization.

102255145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20451034.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 102255145 is about 10112.1286087549. The cubic root of 102255145 is about 467.6221305784.

It can be divided in two parts, 102255 and 145, that added together give a square (102400 = 320²).

The spelling of 102255145 in words is "one hundred two million, two hundred fifty-five thousand, one hundred forty-five".