61455939 has 8 divisors (see below), whose sum is σ = 82928832. Its totient is φ = 40476840.

The previous prime is 61455913. The next prime is 61455971. The reversal of 61455939 is 93955416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61455939 - 2¹¹ = 61453891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61455939.

It is not an unprimeable number, because it can be changed into a prime (61455239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123157 + ... + 123654.

It is an arithmetic number, because the mean of its divisors is an integer number (10366104).

Almost surely, 2^61455939 is an apocalyptic number.

61455939 is a deficient number, since it is larger than the sum of its proper divisors (21472893).

61455939 is a wasteful number, since it uses less digits than its factorization.

61455939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246897.

The product of its digits is 145800, while the sum is 42.

The square root of 61455939 is about 7839.3838405834. The cubic root of 61455939 is about 394.6280512987.

The spelling of 61455939 in words is "sixty-one million, four hundred fifty-five thousand, nine hundred thirty-nine".