101288261 has 4 divisors (see below), whose sum is σ = 107246412. Its totient is φ = 95330112.

The previous prime is 101288237. The next prime is 101288267. The reversal of 101288261 is 162882101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162882101 = 4723 ⋅34487.

It can be written as a sum of positive squares in 2 ways, for example, as 70040161 + 31248100 = 8369^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 101288261 - 2⁶ = 101288197 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 (101288267) 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, 2979050 + ... + 2979083.

It is an arithmetic number, because the mean of its divisors is an integer number (26811603).

Almost surely, 2^101288261 is an apocalyptic number.

It is an amenable number.

101288261 is a deficient number, since it is larger than the sum of its proper divisors (5958151).

101288261 is an equidigital number, since it uses as much as digits as its factorization.

101288261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958150.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 101288261 is about 10064.2069235484. The cubic root of 101288261 is about 466.1435775479.

The spelling of 101288261 in words is "one hundred one million, two hundred eighty-eight thousand, two hundred sixty-one".