102661511 has 4 divisors (see below), whose sum is σ = 105049032. Its totient is φ = 100273992.

The previous prime is 102661459. The next prime is 102661529. The reversal of 102661511 is 115166201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115166201 = 19 ⋅6061379.

It is a cyclic number.

It is not a de Polignac number, because 102661511 - 2¹⁰ = 102660487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102661561) 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, 1193696 + ... + 1193781.

It is an arithmetic number, because the mean of its divisors is an integer number (26262258).

Almost surely, 2^102661511 is an apocalyptic number.

102661511 is a deficient number, since it is larger than the sum of its proper divisors (2387521).

102661511 is an equidigital number, since it uses as much as digits as its factorization.

102661511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387520.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 102661511 is about 10132.2016857147. The cubic root of 102661511 is about 468.2407614412.

The spelling of 102661511 in words is "one hundred two million, six hundred sixty-one thousand, five hundred eleven".