61544421 has 8 divisors (see below), whose sum is σ = 91176960. Its totient is φ = 41029596.

The previous prime is 61544407. The next prime is 61544423. The reversal of 61544421 is 12444516.

61544421 is a `hidden beast` number, since 615 + 4 + 4 + 42 + 1 = 666.

It is not a de Polignac number, because 61544421 - 2¹⁴ = 61528037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2279423 = 61544421 / (6 + 1 + 5 + 4 + 4 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61544423) 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, 1139685 + ... + 1139738.

It is an arithmetic number, because the mean of its divisors is an integer number (11397120).

Almost surely, 2^61544421 is an apocalyptic number.

It is an amenable number.

61544421 is a deficient number, since it is larger than the sum of its proper divisors (29632539).

61544421 is a wasteful number, since it uses less digits than its factorization.

61544421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279432 (or 2279426 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 61544421 is about 7845.0252389651. The cubic root of 61544421 is about 394.8173507955.

Adding to 61544421 its reverse (12444516), we get a palindrome (73988937).

The spelling of 61544421 in words is "sixty-one million, five hundred forty-four thousand, four hundred twenty-one".