101005642 has 4 divisors (see below), whose sum is σ = 151508466. Its totient is φ = 50502820.

The previous prime is 101005621. The next prime is 101005661. The reversal of 101005642 is 246500101.

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., 79762761 + 21242881 = 8931^2 + 4609^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25251409 + ... + 25251412.

Almost surely, 2^101005642 is an apocalyptic number.

101005642 is a deficient number, since it is larger than the sum of its proper divisors (50502824).

101005642 is an equidigital number, since it uses as much as digits as its factorization.

101005642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50502823.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 101005642 is about 10050.1563171923. The cubic root of 101005642 is about 465.7096221858.

Adding to 101005642 its reverse (246500101), we get a palindrome (347505743).

The spelling of 101005642 in words is "one hundred one million, five thousand, six hundred forty-two".