61288421 has 2 divisors, whose sum is σ = 61288422. Its totient is φ = 61288420.

The previous prime is 61288393. The next prime is 61288441. The reversal of 61288421 is 12488216.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 30096196 = 5585^2 + 5486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61288421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61288441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30644210 + 30644211.

It is an arithmetic number, because the mean of its divisors is an integer number (30644211).

Almost surely, 2^61288421 is an apocalyptic number.

It is an amenable number.

61288421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61288421 is an equidigital number, since it uses as much as digits as its factorization.

61288421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 61288421 is about 7828.6921640846. The cubic root of 61288421 is about 394.2691629651.

The spelling of 61288421 in words is "sixty-one million, two hundred eighty-eight thousand, four hundred twenty-one".