61123205 has 16 divisors (see below), whose sum is σ = 86171904. Its totient is φ = 41033280.

The previous prime is 61123201. The next prime is 61123219. The reversal of 61123205 is 50232116.

It is not a de Polignac number, because 61123205 - 2² = 61123201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42029 + ... + 43458.

It is an arithmetic number, because the mean of its divisors is an integer number (5385744).

Almost surely, 2^61123205 is an apocalyptic number.

61123205 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61123205 is a deficient number, since it is larger than the sum of its proper divisors (25048699).

61123205 is a wasteful number, since it uses less digits than its factorization.

61123205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85516.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61123205 is about 7818.1330891716. The cubic root of 61123205 is about 393.9145652922.

It can be divided in two parts, 6 and 1123205, that added together give a palindrome (1123211).

The spelling of 61123205 in words is "sixty-one million, one hundred twenty-three thousand, two hundred five".