61355601 has 12 divisors (see below), whose sum is σ = 93838212. Its totient is φ = 38497536.

The previous prime is 61355599. The next prime is 61355611. The reversal of 61355601 is 10655316.

It is a happy number.

61355601 is a `hidden beast` number, since 6 + 1 + 3 + 55 + 601 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50126400 + 11229201 = 7080^2 + 3351^2 .

It is not a de Polignac number, because 61355601 - 2¹ = 61355599 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61355611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200356 + ... + 200661.

It is an arithmetic number, because the mean of its divisors is an integer number (7819851).

Almost surely, 2^61355601 is an apocalyptic number.

It is an amenable number.

61355601 is a deficient number, since it is larger than the sum of its proper divisors (32482611).

61355601 is a wasteful number, since it uses less digits than its factorization.

61355601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401040 (or 401037 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 61355601 is about 7832.9816162174. The cubic root of 61355601 is about 394.4131669498.

The spelling of 61355601 in words is "sixty-one million, three hundred fifty-five thousand, six hundred one".