213402457 has 2 divisors, whose sum is σ = 213402458. Its totient is φ = 213402456.

The previous prime is 213402373. The next prime is 213402517. The reversal of 213402457 is 754204312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148937616 + 64464841 = 12204^2 + 8029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213402457 is a prime.

It is a super-3 number, since 3×213402457³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (213402157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106701228 + 106701229.

It is an arithmetic number, because the mean of its divisors is an integer number (106701229).

Almost surely, 2^213402457 is an apocalyptic number.

It is an amenable number.

213402457 is a deficient number, since it is larger than the sum of its proper divisors (1).

213402457 is an equidigital number, since it uses as much as digits as its factorization.

213402457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 213402457 is about 14608.3009621242. The cubic root of 213402457 is about 597.5851615570.

Adding to 213402457 its reverse (754204312), we get a palindrome (967606769).

The spelling of 213402457 in words is "two hundred thirteen million, four hundred two thousand, four hundred fifty-seven".