102557945 has 16 divisors (see below), whose sum is σ = 140815488. Its totient is φ = 70243200.

The previous prime is 102557929. The next prime is 102557947. The reversal of 102557945 is 549755201.

It is a happy number.

It is not a de Polignac number, because 102557945 - 2⁴ = 102557929 is a prime.

It is a Smith number, since the sum of its digits (38) 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 junction number, because it is equal to n+sod(n) for n = 102557899 and 102557908.

It is not an unprimeable number, because it can be changed into a prime (102557947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56045 + ... + 57845.

It is an arithmetic number, because the mean of its divisors is an integer number (8800968).

Almost surely, 2^102557945 is an apocalyptic number.

It is an amenable number.

102557945 is a deficient number, since it is larger than the sum of its proper divisors (38257543).

102557945 is a wasteful number, since it uses less digits than its factorization.

102557945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 102557945 is about 10127.0896609046. The cubic root of 102557945 is about 468.0832530806.

The spelling of 102557945 in words is "one hundred two million, five hundred fifty-seven thousand, nine hundred forty-five".