61455571 has 4 divisors (see below), whose sum is σ = 62064144. Its totient is φ = 60847000.

The previous prime is 61455551. The next prime is 61455577. The reversal of 61455571 is 17555416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61455571 - 2⁵ = 61455539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61455577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304135 + ... + 304336.

It is an arithmetic number, because the mean of its divisors is an integer number (15516036).

Almost surely, 2^61455571 is an apocalyptic number.

61455571 is a deficient number, since it is larger than the sum of its proper divisors (608573).

61455571 is a wasteful number, since it uses less digits than its factorization.

61455571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608572.

The product of its digits is 21000, while the sum is 34.

The square root of 61455571 is about 7839.3603693159. The cubic root of 61455571 is about 394.6272636156.

It can be divided in two parts, 61455 and 571, that added together give a palindrome (62026).

The spelling of 61455571 in words is "sixty-one million, four hundred fifty-five thousand, five hundred seventy-one".