51211603 has 2 divisors, whose sum is σ = 51211604. Its totient is φ = 51211602.

The previous prime is 51211577. The next prime is 51211609. The reversal of 51211603 is 30611215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51211603 - 2⁵ = 51211571 is a prime.

It is not a weakly prime, because it can be changed into another prime (51211609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605801 + 25605802.

It is an arithmetic number, because the mean of its divisors is an integer number (25605802).

Almost surely, 2^51211603 is an apocalyptic number.

51211603 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211603 is an equidigital number, since it uses as much as digits as its factorization.

51211603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51211603 is about 7156.2282663425. The cubic root of 51211603 is about 371.3551547554.

Adding to 51211603 its reverse (30611215), we get a palindrome (81822818).

It can be divided in two parts, 5121 and 1603, that added together give a square (6724 = 82²).

The spelling of 51211603 in words is "fifty-one million, two hundred eleven thousand, six hundred three".