61605015 has 16 divisors (see below), whose sum is σ = 100666368. Its totient is φ = 32156576.

The previous prime is 61604993. The next prime is 61605031. The reversal of 61605015 is 51050616.

It is a cyclic number.

It is not a de Polignac number, because 61605015 - 2⁷ = 61604887 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42987 + ... + 44396.

It is an arithmetic number, because the mean of its divisors is an integer number (6291648).

Almost surely, 2^61605015 is an apocalyptic number.

61605015 is a deficient number, since it is larger than the sum of its proper divisors (39061353).

61605015 is a wasteful number, since it uses less digits than its factorization.

61605015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87438.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 61605015 is about 7848.8862267203. The cubic root of 61605015 is about 394.9468817104.

It can be divided in two parts, 6160 and 5015, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 61605015 in words is "sixty-one million, six hundred five thousand, fifteen".