61644001 has 2 divisors, whose sum is σ = 61644002. Its totient is φ = 61644000.

The previous prime is 61643987. The next prime is 61644013. The reversal of 61644001 is 10044616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61214976 + 429025 = 7824^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 61644001 - 2²⁵ = 28089569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61644041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30822000 + 30822001.

It is an arithmetic number, because the mean of its divisors is an integer number (30822001).

Almost surely, 2^61644001 is an apocalyptic number.

It is an amenable number.

61644001 is a deficient number, since it is larger than the sum of its proper divisors (1).

61644001 is an equidigital number, since it uses as much as digits as its factorization.

61644001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 61644001 is about 7851.3693710078. The cubic root of 61644001 is about 395.0301766189.

Adding to 61644001 its reverse (10044616), we get a palindrome (71688617).

The spelling of 61644001 in words is "sixty-one million, six hundred forty-four thousand, one".