61554263 has 4 divisors (see below), whose sum is σ = 65175120. Its totient is φ = 57933408.

The previous prime is 61554239. The next prime is 61554277. The reversal of 61554263 is 36245516.

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 61554263 - 2⁸ = 61554007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61554203) 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 in 3 ways as a sum of consecutive naturals, for example, 1810403 + ... + 1810436.

It is an arithmetic number, because the mean of its divisors is an integer number (16293780).

Almost surely, 2^61554263 is an apocalyptic number.

61554263 is a deficient number, since it is larger than the sum of its proper divisors (3620857).

61554263 is a wasteful number, since it uses less digits than its factorization.

61554263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620856.

The product of its digits is 21600, while the sum is 32.

The square root of 61554263 is about 7845.6524903924. The cubic root of 61554263 is about 394.8383956776.

Adding to 61554263 its reverse (36245516), we get a palindrome (97799779).

The spelling of 61554263 in words is "sixty-one million, five hundred fifty-four thousand, two hundred sixty-three".