102145747 has 4 divisors (see below), whose sum is σ = 111431736. Its totient is φ = 92859760.

The previous prime is 102145727. The next prime is 102145751. The reversal of 102145747 is 747541201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747541201 = 11 ⋅67958291.

It is a cyclic number.

It is not a de Polignac number, because 102145747 - 2¹⁹ = 101621459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102145727) 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, 4642978 + ... + 4642999.

It is an arithmetic number, because the mean of its divisors is an integer number (27857934).

Almost surely, 2^102145747 is an apocalyptic number.

102145747 is a deficient number, since it is larger than the sum of its proper divisors (9285989).

102145747 is an equidigital number, since it uses as much as digits as its factorization.

102145747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9285988.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 102145747 is about 10106.7179143380. The cubic root of 102145747 is about 467.4553087193.

Adding to 102145747 its reverse (747541201), we get a palindrome (849686948).

The spelling of 102145747 in words is "one hundred two million, one hundred forty-five thousand, seven hundred forty-seven".