61555071 has 8 divisors (see below), whose sum is σ = 82294960. Its totient is φ = 40925952.

The previous prime is 61555051. The next prime is 61555073. The reversal of 61555071 is 17055516.

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

It is not a de Polignac number, because 61555071 - 2¹⁰ = 61554047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555073) 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, 26386 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (10286870).

Almost surely, 2^61555071 is an apocalyptic number.

61555071 is a deficient number, since it is larger than the sum of its proper divisors (20739889).

61555071 is a wasteful number, since it uses less digits than its factorization.

61555071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55385.

The product of its (nonzero) digits is 5250, while the sum is 30.

The square root of 61555071 is about 7845.7039837098. The cubic root of 61555071 is about 394.8401233025.

The spelling of 61555071 in words is "sixty-one million, five hundred fifty-five thousand, seventy-one".