61520243 has 2 divisors, whose sum is σ = 61520244. Its totient is φ = 61520242.

The previous prime is 61520237. The next prime is 61520257. The reversal of 61520243 is 34202516.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61520243 is a prime.

It is not a weakly prime, because it can be changed into another prime (61520203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760121 + 30760122.

It is an arithmetic number, because the mean of its divisors is an integer number (30760122).

Almost surely, 2^61520243 is an apocalyptic number.

61520243 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520243 is an equidigital number, since it uses as much as digits as its factorization.

61520243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 61520243 is about 7843.4841110313. The cubic root of 61520243 is about 394.7656421052.

Adding to 61520243 its reverse (34202516), we get a palindrome (95722759).

The spelling of 61520243 in words is "sixty-one million, five hundred twenty thousand, two hundred forty-three".