61799999 has 2 divisors, whose sum is σ = 61800000. Its totient is φ = 61799998.

The previous prime is 61799977. The next prime is 61800007. The reversal of 61799999 is 99999716.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61799999 is a prime.

61799999 is a modest number, since divided by 9999 gives 6179 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61799939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30899999 + 30900000.

It is an arithmetic number, because the mean of its divisors is an integer number (30900000).

Almost surely, 2^61799999 is an apocalyptic number.

61799999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61799999 is an equidigital number, since it uses as much as digits as its factorization.

61799999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2480058, while the sum is 59.

The square root of 61799999 is about 7861.2975392107. The cubic root of 61799999 is about 395.3631206581.

The spelling of 61799999 in words is "sixty-one million, seven hundred ninety-nine thousand, nine hundred ninety-nine".