281720060331261 has 32 divisors (see below), whose sum is σ = 388850182502400. Its totient is φ = 181210699158720.

The previous prime is 281720060331191. The next prime is 281720060331271. The reversal of 281720060331261 is 162133060027182.

It is not a de Polignac number, because 281720060331261 - 2⁹ = 281720060330749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281720060331271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2081828160 + ... + 2081963478.

It is an arithmetic number, because the mean of its divisors is an integer number (12151568203200).

Almost surely, 2^{281720060331261} is an apocalyptic number.

It is an amenable number.

281720060331261 is a deficient number, since it is larger than the sum of its proper divisors (107130122171139).

281720060331261 is a wasteful number, since it uses less digits than its factorization.

281720060331261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151849.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 281720060331261 in words is "two hundred eighty-one trillion, seven hundred twenty billion, sixty million, three hundred thirty-one thousand, two hundred sixty-one".