61099839 has 60 divisors (see below), whose sum is σ = 102148200. Its totient is φ = 36251712.

The previous prime is 61099769. The next prime is 61099867. The reversal of 61099839 is 93899016.

It is not a de Polignac number, because 61099839 - 2⁹ = 61099327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61099794 and 61099803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61099739) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1651329 + ... + 1651365.

It is an arithmetic number, because the mean of its divisors is an integer number (1702470).

Almost surely, 2^61099839 is an apocalyptic number.

61099839 is a deficient number, since it is larger than the sum of its proper divisors (41048361).

61099839 is a wasteful number, since it uses less digits than its factorization.

61099839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 61099839 is about 7816.6385998075. The cubic root of 61099839 is about 393.8643640588.

The spelling of 61099839 in words is "sixty-one million, ninety-nine thousand, eight hundred thirty-nine".