61561451 has 8 divisors (see below), whose sum is σ = 72257760. Its totient is φ = 51340608.

The previous prime is 61561447. The next prime is 61561477. The reversal of 61561451 is 15416516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61561451 - 2² = 61561447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118586 + ... + 119103.

It is an arithmetic number, because the mean of its divisors is an integer number (9032220).

Almost surely, 2^61561451 is an apocalyptic number.

61561451 is a deficient number, since it is larger than the sum of its proper divisors (10696309).

61561451 is a wasteful number, since it uses less digits than its factorization.

61561451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237733.

The product of its digits is 3600, while the sum is 29.

The square root of 61561451 is about 7846.1105651144. The cubic root of 61561451 is about 394.8537641660.

Adding to 61561451 its reverse (15416516), we get a palindrome (76977967).

The spelling of 61561451 in words is "sixty-one million, five hundred sixty-one thousand, four hundred fifty-one".