102718645 has 4 divisors (see below), whose sum is σ = 123262380. Its totient is φ = 82174912.

The previous prime is 102718643. The next prime is 102718661. The reversal of 102718645 is 546817201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546817201 = 7 ⋅78116743.

It can be written as a sum of positive squares in 2 ways, for example, as 51008164 + 51710481 = 7142^2 + 7191^2 .

It is a cyclic number.

It is not a de Polignac number, because 102718645 - 2¹ = 102718643 is a prime.

It is a super-2 number, since 2×102718645² = 21102240061272050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102718645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102718643) 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, 10271860 + ... + 10271869.

It is an arithmetic number, because the mean of its divisors is an integer number (30815595).

Almost surely, 2^102718645 is an apocalyptic number.

It is an amenable number.

102718645 is a deficient number, since it is larger than the sum of its proper divisors (20543735).

102718645 is an equidigital number, since it uses as much as digits as its factorization.

102718645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20543734.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 102718645 is about 10135.0207202551. The cubic root of 102718645 is about 468.3276083556.

The spelling of 102718645 in words is "one hundred two million, seven hundred eighteen thousand, six hundred forty-five".