1951822881 has 6 divisors (see below), whose sum is σ = 2819299730. Its totient is φ = 1301215248.

The previous prime is 1951822813. The next prime is 1951822883. The reversal of 1951822881 is 1882281591.

1951822881 is a `hidden beast` number, since 195 + 182 + 288 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1775358225 + 176464656 = 42135^2 + 13284^2 .

It is not a de Polignac number, because 1951822881 - 2²⁶ = 1884714017 is a prime.

It is a super-2 number, since 2×1951822881² = 7619225117590280322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1951822883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108434596 + ... + 108434613.

Almost surely, 2^1951822881 is an apocalyptic number.

It is an amenable number.

1951822881 is a deficient number, since it is larger than the sum of its proper divisors (867476849).

1951822881 is a wasteful number, since it uses less digits than its factorization.

1951822881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216869215 (or 216869212 counting only the distinct ones).

The product of its digits is 92160, while the sum is 45.

The square root of 1951822881 is about 44179.4395731770. The cubic root of 1951822881 is about 1249.7221528587.

The spelling of 1951822881 in words is "one billion, nine hundred fifty-one million, eight hundred twenty-two thousand, eight hundred eighty-one".