61909055 has 16 divisors (see below), whose sum is σ = 82766880. Its totient is φ = 44139648.

The previous prime is 61909051. The next prime is 61909063. The reversal of 61909055 is 55090916.

It is a cyclic number.

It is not a de Polignac number, because 61909055 - 2² = 61909051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61909051) 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, 14537 + ... + 18306.

It is an arithmetic number, because the mean of its divisors is an integer number (5172930).

Almost surely, 2^61909055 is an apocalyptic number.

61909055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61909055 is a deficient number, since it is larger than the sum of its proper divisors (20857825).

61909055 is a wasteful number, since it uses less digits than its factorization.

61909055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32890.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 61909055 is about 7868.2307414056. The cubic root of 61909055 is about 395.5955445195.

The spelling of 61909055 in words is "sixty-one million, nine hundred nine thousand, fifty-five".