951609991 has 2 divisors, whose sum is σ = 951609992. Its totient is φ = 951609990.

The previous prime is 951609977. The next prime is 951610001. The reversal of 951609991 is 199906159.

951609991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (199906159) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 951609991 - 2⁷ = 951609863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (951609931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475804995 + 475804996.

It is an arithmetic number, because the mean of its divisors is an integer number (475804996).

Almost surely, 2^951609991 is an apocalyptic number.

951609991 is a deficient number, since it is larger than the sum of its proper divisors (1).

951609991 is an equidigital number, since it uses as much as digits as its factorization.

951609991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 49.

The square root of 951609991 is about 30848.1764615026. The cubic root of 951609991 is about 983.6025916160.

The spelling of 951609991 in words is "nine hundred fifty-one million, six hundred nine thousand, nine hundred ninety-one".