102640547 has 4 divisors (see below), whose sum is σ = 103092936. Its totient is φ = 102188160.

The previous prime is 102640523. The next prime is 102640561. The reversal of 102640547 is 745046201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745046201 = 1307 ⋅570043.

It is a cyclic number.

It is not a de Polignac number, because 102640547 - 2²⁴ = 85863331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102640567) 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, 225854 + ... + 226307.

It is an arithmetic number, because the mean of its divisors is an integer number (25773234).

Almost surely, 2^102640547 is an apocalyptic number.

102640547 is a deficient number, since it is larger than the sum of its proper divisors (452389).

102640547 is an equidigital number, since it uses as much as digits as its factorization.

102640547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452388.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 102640547 is about 10131.1671094697. The cubic root of 102640547 is about 468.2088868939.

Adding to 102640547 its reverse (745046201), we get a palindrome (847686748).

The spelling of 102640547 in words is "one hundred two million, six hundred forty thousand, five hundred forty-seven".