213551801 has 2 divisors, whose sum is σ = 213551802. Its totient is φ = 213551800.

The previous prime is 213551797. The next prime is 213551809. The reversal of 213551801 is 108155312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212459776 + 1092025 = 14576^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 213551801 - 2² = 213551797 is a prime.

It is not a weakly prime, because it can be changed into another prime (213551809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106775900 + 106775901.

It is an arithmetic number, because the mean of its divisors is an integer number (106775901).

Almost surely, 2^213551801 is an apocalyptic number.

It is an amenable number.

213551801 is a deficient number, since it is larger than the sum of its proper divisors (1).

213551801 is an equidigital number, since it uses as much as digits as its factorization.

213551801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 213551801 is about 14613.4116824238. The cubic root of 213551801 is about 597.7245303799.

The spelling of 213551801 in words is "two hundred thirteen million, five hundred fifty-one thousand, eight hundred one".