211631449 has 2 divisors, whose sum is σ = 211631450. Its totient is φ = 211631448.

The previous prime is 211631411. The next prime is 211631467. The reversal of 211631449 is 944136112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187690000 + 23941449 = 13700^2 + 4893^2 .

It is a cyclic number.

It is not a de Polignac number, because 211631449 - 2¹³ = 211623257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211631449.

It is not a weakly prime, because it can be changed into another prime (211631479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105815724 + 105815725.

It is an arithmetic number, because the mean of its divisors is an integer number (105815725).

Almost surely, 2^211631449 is an apocalyptic number.

It is an amenable number.

211631449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211631449 is an equidigital number, since it uses as much as digits as its factorization.

211631449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 211631449 is about 14547.5581799833. The cubic root of 211631449 is about 595.9274653481.

The spelling of 211631449 in words is "two hundred eleven million, six hundred thirty-one thousand, four hundred forty-nine".