102139071 has 16 divisors (see below), whose sum is σ = 138845280. Its totient is φ = 66769920.

The previous prime is 102139049. The next prime is 102139133. The reversal of 102139071 is 170931201.

It is not a de Polignac number, because 102139071 - 2⁵ = 102139039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102139001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78595 + ... + 79883.

It is an arithmetic number, because the mean of its divisors is an integer number (8677830).

Almost surely, 2^102139071 is an apocalyptic number.

102139071 is a deficient number, since it is larger than the sum of its proper divisors (36706209).

102139071 is a wasteful number, since it uses less digits than its factorization.

102139071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 102139071 is about 10106.3876335712. The cubic root of 102139071 is about 467.4451245798.

The spelling of 102139071 in words is "one hundred two million, one hundred thirty-nine thousand, seventy-one".