19950691 has 2 divisors, whose sum is σ = 19950692. Its totient is φ = 19950690.

The previous prime is 19950661. The next prime is 19950713. The reversal of 19950691 is 19605991.

19950691 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19950691 - 2⁷ = 19950563 is a prime.

It is not a weakly prime, because it can be changed into another prime (19950661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9975345 + 9975346.

It is an arithmetic number, because the mean of its divisors is an integer number (9975346).

Almost surely, 2^19950691 is an apocalyptic number.

19950691 is a deficient number, since it is larger than the sum of its proper divisors (1).

19950691 is an equidigital number, since it uses as much as digits as its factorization.

19950691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 19950691 is about 4466.6196390559. The cubic root of 19950691 is about 271.2185027172.

The spelling of 19950691 in words is "nineteen million, nine hundred fifty thousand, six hundred ninety-one".