213607949491 has 2 divisors, whose sum is σ = 213607949492. Its totient is φ = 213607949490.

The previous prime is 213607949453. The next prime is 213607949497. The reversal of 213607949491 is 194949706312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213607949491 - 2⁹ = 213607948979 is a prime.

It is a super-3 number, since 3×213607949491³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (213607949497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106803974745 + 106803974746.

It is an arithmetic number, because the mean of its divisors is an integer number (106803974746).

Almost surely, 2^213607949491 is an apocalyptic number.

213607949491 is a deficient number, since it is larger than the sum of its proper divisors (1).

213607949491 is an equidigital number, since it uses as much as digits as its factorization.

213607949491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 213607949491 in words is "two hundred thirteen billion, six hundred seven million, nine hundred forty-nine thousand, four hundred ninety-one".