61555471 has 2 divisors, whose sum is σ = 61555472. Its totient is φ = 61555470.

The previous prime is 61555469. The next prime is 61555493. The reversal of 61555471 is 17455516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61555471 - 2¹ = 61555469 is a prime.

It is a super-3 number, since 3×61555471³ (a number of 24 digits) contains 333 as substring.

Together with 61555469, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61555411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777735 + 30777736.

It is an arithmetic number, because the mean of its divisors is an integer number (30777736).

Almost surely, 2^61555471 is an apocalyptic number.

61555471 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555471 is an equidigital number, since it uses as much as digits as its factorization.

61555471 is an evil number, because the sum of its binary digits is even.

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

The square root of 61555471 is about 7845.7294753261. The cubic root of 61555471 is about 394.8409785568.

It can be divided in two parts, 61555 and 471, that added together give a palindrome (62026).

The spelling of 61555471 in words is "sixty-one million, five hundred fifty-five thousand, four hundred seventy-one".