61531222 has 8 divisors (see below), whose sum is σ = 94791456. Its totient is φ = 29934072.

The previous prime is 61531213. The next prime is 61531247. The reversal of 61531222 is 22213516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 61531193 and 61531202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415678 + ... + 415825.

It is an arithmetic number, because the mean of its divisors is an integer number (11848932).

Almost surely, 2^61531222 is an apocalyptic number.

61531222 is a deficient number, since it is larger than the sum of its proper divisors (33260234).

61531222 is a wasteful number, since it uses less digits than its factorization.

61531222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831542.

The product of its digits is 720, while the sum is 22.

The square root of 61531222 is about 7844.1839601070. The cubic root of 61531222 is about 394.7891242089.

Adding to 61531222 its reverse (22213516), we get a palindrome (83744738).

The spelling of 61531222 in words is "sixty-one million, five hundred thirty-one thousand, two hundred twenty-two".