61998451 has 2 divisors, whose sum is σ = 61998452. Its totient is φ = 61998450.

The previous prime is 61998403. The next prime is 61998457. The reversal of 61998451 is 15489916.

61998451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61998451 - 2⁷ = 61998323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61998398 and 61998407.

It is not a weakly prime, because it can be changed into another prime (61998457) 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, 30999225 + 30999226.

It is an arithmetic number, because the mean of its divisors is an integer number (30999226).

Almost surely, 2^61998451 is an apocalyptic number.

61998451 is a deficient number, since it is larger than the sum of its proper divisors (1).

61998451 is an equidigital number, since it uses as much as digits as its factorization.

61998451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 61998451 is about 7873.9095117991. The cubic root of 61998451 is about 395.7858648255.

The spelling of 61998451 in words is "sixty-one million, nine hundred ninety-eight thousand, four hundred fifty-one".