61890247 has 2 divisors, whose sum is σ = 61890248. Its totient is φ = 61890246.

The previous prime is 61890223. The next prime is 61890271. The reversal of 61890247 is 74209816.

It is a balanced prime because it is at equal distance from previous prime (61890223) and next prime (61890271).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61890247 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 (61890347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30945123 + 30945124.

It is an arithmetic number, because the mean of its divisors is an integer number (30945124).

Almost surely, 2^61890247 is an apocalyptic number.

61890247 is a deficient number, since it is larger than the sum of its proper divisors (1).

61890247 is an equidigital number, since it uses as much as digits as its factorization.

61890247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 61890247 is about 7867.0354645190. The cubic root of 61890247 is about 395.5554797578. Note that the first 3 decimals are identical.

The spelling of 61890247 in words is "sixty-one million, eight hundred ninety thousand, two hundred forty-seven".