1000551121 has 2 divisors, whose sum is σ = 1000551122. Its totient is φ = 1000551120.

The previous prime is 1000551113. The next prime is 1000551143. The reversal of 1000551121 is 1211550001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638067600 + 362483521 = 25260^2 + 19039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000551121 - 2³ = 1000551113 is a prime.

It is a super-2 number, since 2×1000551121² = 2002205091468713282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1000551095 and 1000551104.

It is not a weakly prime, because it can be changed into another prime (1000651121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500275560 + 500275561.

It is an arithmetic number, because the mean of its divisors is an integer number (500275561).

Almost surely, 2^1000551121 is an apocalyptic number.

It is an amenable number.

1000551121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000551121 is an equidigital number, since it uses as much as digits as its factorization.

1000551121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 1000551121 is about 31631.4893895308. The cubic root of 1000551121 is about 1000.1836732621.

The spelling of 1000551121 in words is "one billion, five hundred fifty-one thousand, one hundred twenty-one".