61123216 has 40 divisors (see below), whose sum is σ = 147651264. Its totient is φ = 23813760.

The previous prime is 61123201. The next prime is 61123219. The reversal of 61123216 is 61232116.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23575 + ... + 26038.

Almost surely, 2^61123216 is an apocalyptic number.

It is an amenable number.

61123216 is an abundant number, since it is smaller than the sum of its proper divisors (86528048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61123216 is a wasteful number, since it uses less digits than its factorization.

61123216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49639 (or 49633 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 61123216 is about 7818.1337926643. The cubic root of 61123216 is about 393.9145889224.

Subtracting 61123216 from its reverse (61232116), we obtain a square (108900 = 330²).

The spelling of 61123216 in words is "sixty-one million, one hundred twenty-three thousand, two hundred sixteen".