999550051 has 2 divisors, whose sum is σ = 999550052. Its totient is φ = 999550050.

The previous prime is 999550039. The next prime is 999550099. The reversal of 999550051 is 150055999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999550051 - 2²³ = 991161443 is a prime.

It is not a weakly prime, because it can be changed into another prime (999554051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499775025 + 499775026.

It is an arithmetic number, because the mean of its divisors is an integer number (499775026).

Almost surely, 2^999550051 is an apocalyptic number.

999550051 is the 19996-th centered pentagonal number.

999550051 is a deficient number, since it is larger than the sum of its proper divisors (1).

999550051 is an equidigital number, since it uses as much as digits as its factorization.

999550051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91125, while the sum is 43.

The square root of 999550051 is about 31615.6614828790. The cubic root of 999550051 is about 999.8499944995.

The spelling of 999550051 in words is "nine hundred ninety-nine million, five hundred fifty thousand, fifty-one".