61554133 has 2 divisors, whose sum is σ = 61554134. Its totient is φ = 61554132.

The previous prime is 61554121. The next prime is 61554191. The reversal of 61554133 is 33145516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35319249 + 26234884 = 5943^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 61554133 - 2¹³ = 61545941 is a prime.

It is a super-2 number, since 2×61554133² = 7577822578763378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61534133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777066 + 30777067.

It is an arithmetic number, because the mean of its divisors is an integer number (30777067).

Almost surely, 2^61554133 is an apocalyptic number.

It is an amenable number.

61554133 is a deficient number, since it is larger than the sum of its proper divisors (1).

61554133 is an equidigital number, since it uses as much as digits as its factorization.

61554133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 61554133 is about 7845.6442055449. The cubic root of 61554133 is about 394.8381177168.

Adding to 61554133 its reverse (33145516), we get a palindrome (94699649).

The spelling of 61554133 in words is "sixty-one million, five hundred fifty-four thousand, one hundred thirty-three".