213957503 has 2 divisors, whose sum is σ = 213957504. Its totient is φ = 213957502.

The previous prime is 213957493. The next prime is 213957509. The reversal of 213957503 is 305759312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213957503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213957509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106978751 + 106978752.

It is an arithmetic number, because the mean of its divisors is an integer number (106978752).

Almost surely, 2^213957503 is an apocalyptic number.

213957503 is a deficient number, since it is larger than the sum of its proper divisors (1).

213957503 is an equidigital number, since it uses as much as digits as its factorization.

213957503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 213957503 is about 14627.2862486519. The cubic root of 213957503 is about 598.1028064916.

The spelling of 213957503 in words is "two hundred thirteen million, nine hundred fifty-seven thousand, five hundred three".