102890945 has 8 divisors (see below), whose sum is σ = 125160936. Its totient is φ = 81184896.

The previous prime is 102890941. The next prime is 102890951. The reversal of 102890945 is 549098201.

It can be written as a sum of positive squares in 4 ways, for example, as 29463184 + 73427761 = 5428^2 + 8569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102890945 - 2² = 102890941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102890899 and 102890908.

It is not an unprimeable number, because it can be changed into a prime (102890941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140582 + ... + 141311.

It is an arithmetic number, because the mean of its divisors is an integer number (15645117).

Almost surely, 2^102890945 is an apocalyptic number.

It is an amenable number.

102890945 is a deficient number, since it is larger than the sum of its proper divisors (22269991).

102890945 is an equidigital number, since it uses as much as digits as its factorization.

102890945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281971.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 102890945 is about 10143.5173879675. The cubic root of 102890945 is about 468.5893192680.

The spelling of 102890945 in words is "one hundred two million, eight hundred ninety thousand, nine hundred forty-five".