102180749 has 6 divisors (see below), whose sum is σ = 112314510. Its totient is φ = 92891480.

The previous prime is 102180731. The next prime is 102180751. The reversal of 102180749 is 947081201.

It can be written as a sum of positive squares in only one way, i.e., 67158025 + 35022724 = 8195^2 + 5918^2 .

It is not a de Polignac number, because 102180749 - 2¹² = 102176653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102180709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 422114 + ... + 422355.

It is an arithmetic number, because the mean of its divisors is an integer number (18719085).

Almost surely, 2^102180749 is an apocalyptic number.

It is an amenable number.

102180749 is a deficient number, since it is larger than the sum of its proper divisors (10133761).

102180749 is an equidigital number, since it uses as much as digits as its factorization.

102180749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844491 (or 844480 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 102180749 is about 10108.4493865281. The cubic root of 102180749 is about 467.5086964934.

The spelling of 102180749 in words is "one hundred two million, one hundred eighty thousand, seven hundred forty-nine".