102661247 has 12 divisors (see below), whose sum is σ = 115004520. Its totient is φ = 91492128.

The previous prime is 102661241. The next prime is 102661297. The reversal of 102661247 is 742166201.

It is not a de Polignac number, because 102661247 - 2¹⁰ = 102660223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102661241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5573 + ... + 15374.

It is an arithmetic number, because the mean of its divisors is an integer number (9583710).

Almost surely, 2^102661247 is an apocalyptic number.

102661247 is a deficient number, since it is larger than the sum of its proper divisors (12343273).

102661247 is a wasteful number, since it uses less digits than its factorization.

102661247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21002 (or 20989 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 102661247 is about 10132.1886579357. The cubic root of 102661247 is about 468.2403600715.

The spelling of 102661247 in words is "one hundred two million, six hundred sixty-one thousand, two hundred forty-seven".