61522287 has 4 divisors (see below), whose sum is σ = 82029720. Its totient is φ = 41014856.

The previous prime is 61522273. The next prime is 61522319. The reversal of 61522287 is 78222516.

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 61522287 - 2²³ = 53133679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61522267) 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, 10253712 + ... + 10253717.

It is an arithmetic number, because the mean of its divisors is an integer number (20507430).

Almost surely, 2^61522287 is an apocalyptic number.

61522287 is a deficient number, since it is larger than the sum of its proper divisors (20507433).

61522287 is a wasteful number, since it uses less digits than its factorization.

61522287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20507432.

The product of its digits is 13440, while the sum is 33.

The square root of 61522287 is about 7843.6144091866. The cubic root of 61522287 is about 394.7700140647.

The spelling of 61522287 in words is "sixty-one million, five hundred twenty-two thousand, two hundred eighty-seven".