102145554 has 96 divisors (see below), whose sum is σ = 274285440. Its totient is φ = 26804736.

The previous prime is 102145541. The next prime is 102145573. The reversal of 102145554 is 455541201.

102145554 is a `hidden beast` number, since 102 + 1 + 4 + 5 + 554 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91552 + ... + 92660.

It is an arithmetic number, because the mean of its divisors is an integer number (2857140).

Almost surely, 2^102145554 is an apocalyptic number.

102145554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 102145554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137142720).

102145554 is an abundant number, since it is smaller than the sum of its proper divisors (172139886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102145554 is a wasteful number, since it uses less digits than its factorization.

102145554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 102145554 is about 10106.7083662288. The cubic root of 102145554 is about 467.4550143069.

Adding to 102145554 its reverse (455541201), we get a palindrome (557686755).

The spelling of 102145554 in words is "one hundred two million, one hundred forty-five thousand, five hundred fifty-four".