61641499 has 2 divisors, whose sum is σ = 61641500. Its totient is φ = 61641498.

The previous prime is 61641493. The next prime is 61641521. The reversal of 61641499 is 99414616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61641499 - 2⁵ = 61641467 is a prime.

It is not a weakly prime, because it can be changed into another prime (61641493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30820749 + 30820750.

It is an arithmetic number, because the mean of its divisors is an integer number (30820750).

Almost surely, 2^61641499 is an apocalyptic number.

61641499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61641499 is an equidigital number, since it uses as much as digits as its factorization.

61641499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 61641499 is about 7851.2100341285. The cubic root of 61641499 is about 395.0248320660.

The spelling of 61641499 in words is "sixty-one million, six hundred forty-one thousand, four hundred ninety-nine".