61671505 has 16 divisors (see below), whose sum is σ = 84720384. Its totient is φ = 42217920.

The previous prime is 61671499. The next prime is 61671527. The reversal of 61671505 is 50517616.

It is not a de Polignac number, because 61671505 - 2⁷ = 61671377 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27735 + ... + 29875.

It is an arithmetic number, because the mean of its divisors is an integer number (5295024).

Almost surely, 2^61671505 is an apocalyptic number.

It is an amenable number.

61671505 is a deficient number, since it is larger than the sum of its proper divisors (23048879).

61671505 is a wasteful number, since it uses less digits than its factorization.

61671505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 61671505 is about 7853.1207172690. The cubic root of 61671505 is about 395.0889187204.

The spelling of 61671505 in words is "sixty-one million, six hundred seventy-one thousand, five hundred five".