61251979 has 2 divisors, whose sum is σ = 61251980. Its totient is φ = 61251978.

The previous prime is 61251959. The next prime is 61251997. The reversal of 61251979 is 97915216.

61251979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (61251997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61251979 - 2⁵ = 61251947 is a prime.

It is not a weakly prime, because it can be changed into another prime (61251919) 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, 30625989 + 30625990.

It is an arithmetic number, because the mean of its divisors is an integer number (30625990).

Almost surely, 2^61251979 is an apocalyptic number.

61251979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61251979 is an equidigital number, since it uses as much as digits as its factorization.

61251979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 61251979 is about 7826.3643539002. The cubic root of 61251979 is about 394.1910035277.

The spelling of 61251979 in words is "sixty-one million, two hundred fifty-one thousand, nine hundred seventy-nine".