102661049 has 4 divisors (see below), whose sum is σ = 102707280. Its totient is φ = 102614820.

The previous prime is 102661001. The next prime is 102661063. The reversal of 102661049 is 940166201.

102661049 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 940166201 = 13 ⋅72320477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102661049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102661549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19607 + ... + 24284.

It is an arithmetic number, because the mean of its divisors is an integer number (25676820).

Almost surely, 2^102661049 is an apocalyptic number.

It is an amenable number.

102661049 is a deficient number, since it is larger than the sum of its proper divisors (46231).

102661049 is an equidigital number, since it uses as much as digits as its factorization.

102661049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46230.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 102661049 is about 10132.1788870904. The cubic root of 102661049 is about 468.2400590437.

The spelling of 102661049 in words is "one hundred two million, six hundred sixty-one thousand, forty-nine".