102971905 has 4 divisors (see below), whose sum is σ = 123566292. Its totient is φ = 82377520.

The previous prime is 102971893. The next prime is 102971923. The reversal of 102971905 is 509179201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69239041 + 33732864 = 8321^2 + 5808^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102971905 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10297186 + ... + 10297195.

It is an arithmetic number, because the mean of its divisors is an integer number (30891573).

Almost surely, 2^102971905 is an apocalyptic number.

It is an amenable number.

102971905 is a deficient number, since it is larger than the sum of its proper divisors (20594387).

102971905 is an equidigital number, since it uses as much as digits as its factorization.

102971905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20594386.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 102971905 is about 10147.5073293888. The cubic root of 102971905 is about 468.7121906096.

The spelling of 102971905 in words is "one hundred two million, nine hundred seventy-one thousand, nine hundred five".