10219991 has 2 divisors, whose sum is σ = 10219992. Its totient is φ = 10219990.

The previous prime is 10219973. The next prime is 10219997. The reversal of 10219991 is 19991201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10219991 - 2¹⁴ = 10203607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10219997) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109995 + 5109996.

It is an arithmetic number, because the mean of its divisors is an integer number (5109996).

Almost surely, 2^10219991 is an apocalyptic number.

10219991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10219991 is an equidigital number, since it uses as much as digits as its factorization.

10219991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 10219991 is about 3196.8720650035. The cubic root of 10219991 is about 217.0118775663.

The spelling of 10219991 in words is "ten million, two hundred nineteen thousand, nine hundred ninety-one".