102100261 has 4 divisors (see below), whose sum is σ = 102469132. Its totient is φ = 101731392.

The previous prime is 102100259. The next prime is 102100277. The reversal of 102100261 is 162001201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70392100 + 31708161 = 8390^2 + 5631^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100261 - 2¹ = 102100259 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 (102100211) 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, 184020 + ... + 184573.

It is an arithmetic number, because the mean of its divisors is an integer number (25617283).

Almost surely, 2^102100261 is an apocalyptic number.

It is an amenable number.

102100261 is a deficient number, since it is larger than the sum of its proper divisors (368871).

102100261 is an equidigital number, since it uses as much as digits as its factorization.

102100261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368870.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 102100261 is about 10104.4673783431. The cubic root of 102100261 is about 467.3859117067.

Adding to 102100261 its reverse (162001201), we get a palindrome (264101462).

The spelling of 102100261 in words is "one hundred two million, one hundred thousand, two hundred sixty-one".