61521203 has 2 divisors, whose sum is σ = 61521204. Its totient is φ = 61521202.

The previous prime is 61521199. The next prime is 61521233. The reversal of 61521203 is 30212516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61521203 - 2² = 61521199 is a prime.

It is not a weakly prime, because it can be changed into another prime (61521233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760601 + 30760602.

It is an arithmetic number, because the mean of its divisors is an integer number (30760602).

Almost surely, 2^61521203 is an apocalyptic number.

61521203 is a deficient number, since it is larger than the sum of its proper divisors (1).

61521203 is an equidigital number, since it uses as much as digits as its factorization.

61521203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61521203 is about 7843.5453080861. The cubic root of 61521203 is about 394.7676954837.

Adding to 61521203 its reverse (30212516), we get a palindrome (91733719).

The spelling of 61521203 in words is "sixty-one million, five hundred twenty-one thousand, two hundred three".