201581270781 has 8 divisors (see below), whose sum is σ = 293209121184. Its totient is φ = 122170467120.

The previous prime is 201581270767. The next prime is 201581270861. The reversal of 201581270781 is 187072185102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201581270781 - 2⁹ = 201581270269 is a prime.

It is a super-2 number, since 2×201581270781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201581270731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3054261646 + ... + 3054261711.

It is an arithmetic number, because the mean of its divisors is an integer number (36651140148).

Almost surely, 2^201581270781 is an apocalyptic number.

It is an amenable number.

201581270781 is a deficient number, since it is larger than the sum of its proper divisors (91627850403).

201581270781 is a wasteful number, since it uses less digits than its factorization.

201581270781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108523371.

The product of its (nonzero) digits is 62720, while the sum is 42.

The spelling of 201581270781 in words is "two hundred one billion, five hundred eighty-one million, two hundred seventy thousand, seven hundred eighty-one".