102538642 has 4 divisors (see below), whose sum is σ = 153807966. Its totient is φ = 51269320.

The previous prime is 102538523. The next prime is 102538651. The reversal of 102538642 is 246835201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 50395801 = 7221^2 + 7099^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25634659 + ... + 25634662.

Almost surely, 2^102538642 is an apocalyptic number.

102538642 is a deficient number, since it is larger than the sum of its proper divisors (51269324).

102538642 is an equidigital number, since it uses as much as digits as its factorization.

102538642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51269323.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 102538642 is about 10126.1365781822. The cubic root of 102538642 is about 468.0538843891.

The spelling of 102538642 in words is "one hundred two million, five hundred thirty-eight thousand, six hundred forty-two".