1550440081 has 2 divisors, whose sum is σ = 1550440082. Its totient is φ = 1550440080.

The previous prime is 1550440061. The next prime is 1550440091. The reversal of 1550440081 is 1800440551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1506681856 + 43758225 = 38816^2 + 6615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550440081 - 2⁷ = 1550439953 is a prime.

It is a super-3 number, since 3×1550440081³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1550440061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775220040 + 775220041.

It is an arithmetic number, because the mean of its divisors is an integer number (775220041).

Almost surely, 2^1550440081 is an apocalyptic number.

It is an amenable number.

1550440081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550440081 is an equidigital number, since it uses as much as digits as its factorization.

1550440081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 1550440081 is about 39375.6280076902. The cubic root of 1550440081 is about 1157.4040444972.

The spelling of 1550440081 in words is "one billion, five hundred fifty million, four hundred forty thousand, eighty-one".