61891801 has 4 divisors (see below), whose sum is σ = 61920000. Its totient is φ = 61863604.

The previous prime is 61891783. The next prime is 61891807. The reversal of 61891801 is 10819816.

61891801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61891801 - 2¹⁷ = 61760729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61891807) 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 3 ways as a sum of consecutive naturals, for example, 10501 + ... + 15298.

It is an arithmetic number, because the mean of its divisors is an integer number (15480000).

Almost surely, 2^61891801 is an apocalyptic number.

It is an amenable number.

61891801 is a deficient number, since it is larger than the sum of its proper divisors (28199).

61891801 is a wasteful number, since it uses less digits than its factorization.

61891801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28198.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 61891801 is about 7867.1342304552. The cubic root of 61891801 is about 395.5587903929.

The spelling of 61891801 in words is "sixty-one million, eight hundred ninety-one thousand, eight hundred one".