61563451 has 4 divisors (see below), whose sum is σ = 61579152. Its totient is φ = 61547752.

The previous prime is 61563431. The next prime is 61563473. The reversal of 61563451 is 15436516.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61563451 - 2⁹ = 61562939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61563421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3561 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (15394788).

Almost surely, 2^61563451 is an apocalyptic number.

61563451 is a deficient number, since it is larger than the sum of its proper divisors (15701).

61563451 is an equidigital number, since it uses as much as digits as its factorization.

61563451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15700.

The product of its digits is 10800, while the sum is 31.

The square root of 61563451 is about 7846.2380157627. The cubic root of 61563451 is about 394.8580401047.

Adding to 61563451 its reverse (15436516), we get a palindrome (76999967).

The spelling of 61563451 in words is "sixty-one million, five hundred sixty-three thousand, four hundred fifty-one".