213651401 has 2 divisors, whose sum is σ = 213651402. Its totient is φ = 213651400.

The previous prime is 213651281. The next prime is 213651407. The reversal of 213651401 is 104156312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213160000 + 491401 = 14600^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 213651401 - 2²⁶ = 146542537 is a prime.

It is a super-2 number, since 2×213651401² = 91293842298525602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213651407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106825700 + 106825701.

It is an arithmetic number, because the mean of its divisors is an integer number (106825701).

Almost surely, 2^213651401 is an apocalyptic number.

It is an amenable number.

213651401 is a deficient number, since it is larger than the sum of its proper divisors (1).

213651401 is an equidigital number, since it uses as much as digits as its factorization.

213651401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 213651401 is about 14616.8191136102. The cubic root of 213651401 is about 597.8174416547.

The spelling of 213651401 in words is "two hundred thirteen million, six hundred fifty-one thousand, four hundred one".