102647491 has 4 divisors (see below), whose sum is σ = 103134184. Its totient is φ = 102160800.

The previous prime is 102647471. The next prime is 102647521. The reversal of 102647491 is 194746201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194746201 = 13 ⋅14980477.

It is a cyclic number.

It is not a de Polignac number, because 102647491 - 2¹⁵ = 102614723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102647401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243030 + ... + 243451.

It is an arithmetic number, because the mean of its divisors is an integer number (25783546).

Almost surely, 2^102647491 is an apocalyptic number.

102647491 is a deficient number, since it is larger than the sum of its proper divisors (486693).

102647491 is an equidigital number, since it uses as much as digits as its factorization.

102647491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486692.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 102647491 is about 10131.5098085132. The cubic root of 102647491 is about 468.2194453242.

The spelling of 102647491 in words is "one hundred two million, six hundred forty-seven thousand, four hundred ninety-one".