101947381265 has 4 divisors (see below), whose sum is σ = 122336857524. Its totient is φ = 81557905008.

The previous prime is 101947381247. The next prime is 101947381267. The reversal of 101947381265 is 562183749101.

It is a Cunningham number, because it is equal to 319292²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562183749101 = 13 ⋅43244903777.

It can be written as a sum of positive squares in 2 ways, for example, as 36701363776 + 65246017489 = 191576^2 + 255433^2 .

It is a cyclic number.

It is not a de Polignac number, because 101947381265 - 2⁶ = 101947381201 is a prime.

It is a super-3 number, since 3×101947381265³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (101947381267) 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, 10194738122 + ... + 10194738131.

It is an arithmetic number, because the mean of its divisors is an integer number (30584214381).

It is a 1-persistent number, because it is pandigital, but 2⋅101947381265 = 203894762530 is not.

Almost surely, 2^101947381265 is an apocalyptic number.

It is an amenable number.

101947381265 is a deficient number, since it is larger than the sum of its proper divisors (20389476259).

101947381265 is an equidigital number, since it uses as much as digits as its factorization.

101947381265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20389476258.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 101947381265 in words is "one hundred one billion, nine hundred forty-seven million, three hundred eighty-one thousand, two hundred sixty-five".