61440451 has 4 divisors (see below), whose sum is σ = 61575352. Its totient is φ = 61305552.

The previous prime is 61440439. The next prime is 61440487. The reversal of 61440451 is 15404416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61440451 - 2¹⁷ = 61309379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61440251) 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, 66765 + ... + 67678.

It is an arithmetic number, because the mean of its divisors is an integer number (15393838).

Almost surely, 2^61440451 is an apocalyptic number.

61440451 is the 4526-th hex number.

61440451 is a deficient number, since it is larger than the sum of its proper divisors (134901).

61440451 is a wasteful number, since it uses less digits than its factorization.

61440451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134900.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 61440451 is about 7838.3959456001. The cubic root of 61440451 is about 394.5948973954.

Adding to 61440451 its reverse (15404416), we get a palindrome (76844867).

The spelling of 61440451 in words is "sixty-one million, four hundred forty thousand, four hundred fifty-one".