281949891977 has 4 divisors (see below), whose sum is σ = 303638345220. Its totient is φ = 260261438736.

The previous prime is 281949891967. The next prime is 281949891991. The reversal of 281949891977 is 779198949182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15462673801 + 266487218176 = 124349^2 + 516224^2 .

It is not a de Polignac number, because 281949891977 - 2²⁶ = 281882783113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281949891947) 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, 10844226602 + ... + 10844226627.

It is an arithmetic number, because the mean of its divisors is an integer number (75909586305).

Almost surely, 2^281949891977 is an apocalyptic number.

It is an amenable number.

281949891977 is a deficient number, since it is larger than the sum of its proper divisors (21688453243).

281949891977 is a wasteful number, since it uses less digits than its factorization.

281949891977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21688453242.

The product of its digits is 164602368, while the sum is 74.

The spelling of 281949891977 in words is "two hundred eighty-one billion, nine hundred forty-nine million, eight hundred ninety-one thousand, nine hundred seventy-seven".