61287223 has 4 divisors (see below), whose sum is σ = 62126848. Its totient is φ = 60447600.

The previous prime is 61287221. The next prime is 61287263. The reversal of 61287223 is 32278216.

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 61287223 - 2¹ = 61287221 is a prime.

It is a super-2 number, since 2×61287223² = 7512247406103458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61287221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419703 + ... + 419848.

It is an arithmetic number, because the mean of its divisors is an integer number (15531712).

Almost surely, 2^61287223 is an apocalyptic number.

61287223 is a deficient number, since it is larger than the sum of its proper divisors (839625).

61287223 is an equidigital number, since it uses as much as digits as its factorization.

61287223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839624.

The product of its digits is 8064, while the sum is 31.

The square root of 61287223 is about 7828.6156502922. The cubic root of 61287223 is about 394.2665940321.

The spelling of 61287223 in words is "sixty-one million, two hundred eighty-seven thousand, two hundred twenty-three".