102180542 has 4 divisors (see below), whose sum is σ = 153270816. Its totient is φ = 51090270.

The previous prime is 102180541. The next prime is 102180571. The reversal of 102180542 is 245081201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245081201 = 397 ⋅617333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102180541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25545134 + ... + 25545137.

It is an arithmetic number, because the mean of its divisors is an integer number (38317704).

Almost surely, 2^102180542 is an apocalyptic number.

102180542 is a deficient number, since it is larger than the sum of its proper divisors (51090274).

102180542 is an equidigital number, since it uses as much as digits as its factorization.

102180542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51090273.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 102180542 is about 10108.4391475638. The cubic root of 102180542 is about 467.5083807967.

The spelling of 102180542 in words is "one hundred two million, one hundred eighty thousand, five hundred forty-two".