61811471 has 2 divisors, whose sum is σ = 61811472. Its totient is φ = 61811470.

The previous prime is 61811461. The next prime is 61811537. The reversal of 61811471 is 17411816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61811471 - 2¹⁰ = 61810447 is a prime.

It is a super-3 number, since 3×61811471³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61811411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905735 + 30905736.

It is an arithmetic number, because the mean of its divisors is an integer number (30905736).

Almost surely, 2^61811471 is an apocalyptic number.

61811471 is a deficient number, since it is larger than the sum of its proper divisors (1).

61811471 is an equidigital number, since it uses as much as digits as its factorization.

61811471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 61811471 is about 7862.0271558931. The cubic root of 61811471 is about 395.3875830377.

The spelling of 61811471 in words is "sixty-one million, eight hundred eleven thousand, four hundred seventy-one".