213957769 has 2 divisors, whose sum is σ = 213957770. Its totient is φ = 213957768.

The previous prime is 213957743. The next prime is 213957773. The reversal of 213957769 is 967759312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207014544 + 6943225 = 14388^2 + 2635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213957769 is a prime.

It is a super-2 number, since 2×213957769² = 91555853830914722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213957739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106978884 + 106978885.

It is an arithmetic number, because the mean of its divisors is an integer number (106978885).

Almost surely, 2^213957769 is an apocalyptic number.

It is an amenable number.

213957769 is a deficient number, since it is larger than the sum of its proper divisors (1).

213957769 is an equidigital number, since it uses as much as digits as its factorization.

213957769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 49.

The square root of 213957769 is about 14627.2953412447. The cubic root of 213957769 is about 598.1030543527.

The spelling of 213957769 in words is "two hundred thirteen million, nine hundred fifty-seven thousand, seven hundred sixty-nine".