213948649 has 2 divisors, whose sum is σ = 213948650. Its totient is φ = 213948648.

The previous prime is 213948643. The next prime is 213948667. The reversal of 213948649 is 946849312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197908624 + 16040025 = 14068^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 213948649 - 2³ = 213948641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213948599 and 213948608.

It is not a weakly prime, because it can be changed into another prime (213948641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106974324 + 106974325.

It is an arithmetic number, because the mean of its divisors is an integer number (106974325).

Almost surely, 2^213948649 is an apocalyptic number.

It is an amenable number.

213948649 is a deficient number, since it is larger than the sum of its proper divisors (1).

213948649 is an equidigital number, since it uses as much as digits as its factorization.

213948649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The square root of 213948649 is about 14626.9835919782. The cubic root of 213948649 is about 598.0945561377.

The spelling of 213948649 in words is "two hundred thirteen million, nine hundred forty-eight thousand, six hundred forty-nine".