213656503 has 2 divisors, whose sum is σ = 213656504. Its totient is φ = 213656502.

The previous prime is 213656497. The next prime is 213656507. The reversal of 213656503 is 305656312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213656503 - 2²¹ = 211559351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213656507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106828251 + 106828252.

It is an arithmetic number, because the mean of its divisors is an integer number (106828252).

Almost surely, 2^213656503 is an apocalyptic number.

213656503 is a deficient number, since it is larger than the sum of its proper divisors (1).

213656503 is an equidigital number, since it uses as much as digits as its factorization.

213656503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 213656503 is about 14616.9936375439. The cubic root of 213656503 is about 597.8222002479.

The spelling of 213656503 in words is "two hundred thirteen million, six hundred fifty-six thousand, five hundred three".