61251811 has 2 divisors, whose sum is σ = 61251812. Its totient is φ = 61251810.

The previous prime is 61251809. The next prime is 61251851. The reversal of 61251811 is 11815216.

It is a happy number.

61251811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61251811 - 2¹ = 61251809 is a prime.

Together with 61251809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61251851) 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 as a sum of consecutive naturals, namely, 30625905 + 30625906.

It is an arithmetic number, because the mean of its divisors is an integer number (30625906).

Almost surely, 2^61251811 is an apocalyptic number.

61251811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61251811 is an equidigital number, since it uses as much as digits as its factorization.

61251811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 25.

The square root of 61251811 is about 7826.3536209400. The cubic root of 61251811 is about 394.1906431359.

The spelling of 61251811 in words is "sixty-one million, two hundred fifty-one thousand, eight hundred eleven".