1550822981 has 2 divisors, whose sum is σ = 1550822982. Its totient is φ = 1550822980.

The previous prime is 1550822963. The next prime is 1550823007. The reversal of 1550822981 is 1892280551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1274133025 + 276689956 = 35695^2 + 16634^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550822981 - 2¹⁴ = 1550806597 is a prime.

It is a super-2 number, since 2×1550822981² = 4810103836795452722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550822881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775411490 + 775411491.

It is an arithmetic number, because the mean of its divisors is an integer number (775411491).

Almost surely, 2^1550822981 is an apocalyptic number.

It is an amenable number.

1550822981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550822981 is an equidigital number, since it uses as much as digits as its factorization.

1550822981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 1550822981 is about 39380.4898522098. The cubic root of 1550822981 is about 1157.4993149814.

The spelling of 1550822981 in words is "one billion, five hundred fifty million, eight hundred twenty-two thousand, nine hundred eighty-one".