1771228881 has 12 divisors (see below), whose sum is σ = 2589267408. Its totient is φ = 1166592024.

The previous prime is 1771228871. The next prime is 1771228883. The reversal of 1771228881 is 1888221771.

It is a happy number.

It is not a de Polignac number, because 1771228881 - 2¹¹ = 1771226833 is a prime.

It is a super-2 number, since 2×1771228881² = 6274503497777024322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1771228883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1184815 + ... + 1186308.

It is an arithmetic number, because the mean of its divisors is an integer number (215772284).

Almost surely, 2^1771228881 is an apocalyptic number.

It is an amenable number.

1771228881 is a deficient number, since it is larger than the sum of its proper divisors (818038527).

1771228881 is a wasteful number, since it uses less digits than its factorization.

1771228881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371212 (or 2371209 counting only the distinct ones).

The product of its digits is 100352, while the sum is 45.

The square root of 1771228881 is about 42085.9701206946. The cubic root of 1771228881 is about 1209.9243813591.

The spelling of 1771228881 in words is "one billion, seven hundred seventy-one million, two hundred twenty-eight thousand, eight hundred eighty-one".