101378308261 has 4 divisors (see below), whose sum is σ = 101577480300. Its totient is φ = 101179136224.

The previous prime is 101378308133. The next prime is 101378308333. The reversal of 101378308261 is 162803873101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162803873101 = 83 ⋅1961492447.

It can be written as a sum of positive squares in 2 ways, for example, as 57097102500 + 44281205761 = 238950^2 + 210431^2 .

It is a cyclic number.

It is not a de Polignac number, because 101378308261 - 2⁷ = 101378308133 is a prime.

It is a super-2 number, since 2×101378308261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101378303261) 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, 99585256 + ... + 99586273.

It is an arithmetic number, because the mean of its divisors is an integer number (25394370075).

Almost surely, 2^101378308261 is an apocalyptic number.

It is an amenable number.

101378308261 is a deficient number, since it is larger than the sum of its proper divisors (199172039).

101378308261 is an equidigital number, since it uses as much as digits as its factorization.

101378308261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199172038.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 101378308261 in words is "one hundred one billion, three hundred seventy-eight million, three hundred eight thousand, two hundred sixty-one".