61786421 has 2 divisors, whose sum is σ = 61786422. Its totient is φ = 61786420.

The previous prime is 61786409. The next prime is 61786427. The reversal of 61786421 is 12468716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60996100 + 790321 = 7810^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 61786421 - 2⁶ = 61786357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61786427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30893210 + 30893211.

It is an arithmetic number, because the mean of its divisors is an integer number (30893211).

Almost surely, 2^61786421 is an apocalyptic number.

It is an amenable number.

61786421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61786421 is an equidigital number, since it uses as much as digits as its factorization.

61786421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 61786421 is about 7860.4338938763. The cubic root of 61786421 is about 395.3341636261.

The spelling of 61786421 in words is "sixty-one million, seven hundred eighty-six thousand, four hundred twenty-one".