61105999 has 2 divisors, whose sum is σ = 61106000. Its totient is φ = 61105998.

The previous prime is 61105931. The next prime is 61106021. The reversal of 61105999 is 99950116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61105999 - 2⁹ = 61105487 is a prime.

It is a super-2 number, since 2×61105999² = 7467886227576002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61105199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30552999 + 30553000.

It is an arithmetic number, because the mean of its divisors is an integer number (30553000).

Almost surely, 2^61105999 is an apocalyptic number.

61105999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61105999 is an equidigital number, since it uses as much as digits as its factorization.

61105999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 61105999 is about 7817.0326211421. The cubic root of 61105999 is about 393.8775998981.

The spelling of 61105999 in words is "sixty-one million, one hundred five thousand, nine hundred ninety-nine".