102345445 has 4 divisors (see below), whose sum is σ = 122814540. Its totient is φ = 81876352.

The previous prime is 102345443. The next prime is 102345493. The reversal of 102345445 is 544543201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544543201 = 17 ⋅32031953.

It can be written as a sum of positive squares in 2 ways, for example, as 22743361 + 79602084 = 4769^2 + 8922^2 .

It is a cyclic number.

It is not a de Polignac number, because 102345445 - 2¹ = 102345443 is a prime.

It is a super-2 number, since 2×102345445² = 20949180224496050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102345443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10234540 + ... + 10234549.

It is an arithmetic number, because the mean of its divisors is an integer number (30703635).

Almost surely, 2^102345445 is an apocalyptic number.

It is an amenable number.

102345445 is a deficient number, since it is larger than the sum of its proper divisors (20469095).

102345445 is an equidigital number, since it uses as much as digits as its factorization.

102345445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20469094.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 102345445 is about 10116.5925587621. The cubic root of 102345445 is about 467.7597401324.

Adding to 102345445 its reverse (544543201), we get a palindrome (646888646).

The spelling of 102345445 in words is "one hundred two million, three hundred forty-five thousand, four hundred forty-five".