213090557 has 2 divisors, whose sum is σ = 213090558. Its totient is φ = 213090556.

The previous prime is 213090533. The next prime is 213090569. The reversal of 213090557 is 755090312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189915961 + 23174596 = 13781^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 213090557 - 2²² = 208896253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213090517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106545278 + 106545279.

It is an arithmetic number, because the mean of its divisors is an integer number (106545279).

Almost surely, 2^213090557 is an apocalyptic number.

It is an amenable number.

213090557 is a deficient number, since it is larger than the sum of its proper divisors (1).

213090557 is an equidigital number, since it uses as much as digits as its factorization.

213090557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 213090557 is about 14597.6216213464. The cubic root of 213090557 is about 597.2938845440.

The spelling of 213090557 in words is "two hundred thirteen million, ninety thousand, five hundred fifty-seven".