61891271 has 16 divisors (see below), whose sum is σ = 71745408. Its totient is φ = 52876800.

The previous prime is 61891259. The next prime is 61891301. The reversal of 61891271 is 17219816.

61891271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61891271 - 2¹⁰ = 61890247 is a prime.

It is a super-3 number, since 3×61891271³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11186 + ... + 15776.

It is an arithmetic number, because the mean of its divisors is an integer number (4484088).

Almost surely, 2^61891271 is an apocalyptic number.

61891271 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61891271 is a deficient number, since it is larger than the sum of its proper divisors (9854137).

61891271 is a wasteful number, since it uses less digits than its factorization.

61891271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682.

The product of its digits is 6048, while the sum is 35.

The square root of 61891271 is about 7867.1005459445. The cubic root of 61891271 is about 395.5576612894.

The spelling of 61891271 in words is "sixty-one million, eight hundred ninety-one thousand, two hundred seventy-one".