61951816 has 16 divisors (see below), whose sum is σ = 116941500. Its totient is φ = 30767424.

The previous prime is 61951807. The next prime is 61951817. The reversal of 61951816 is 61815916.

61951816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54908100 + 7043716 = 7410^2 + 2654^2 .

It is not an unprimeable number, because it can be changed into a prime (61951817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24795 + ... + 27178.

Almost surely, 2^61951816 is an apocalyptic number.

It is an amenable number.

61951816 is a deficient number, since it is larger than the sum of its proper divisors (54989684).

61951816 is a wasteful number, since it uses less digits than its factorization.

61951816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52128 (or 52124 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 61951816 is about 7870.9475922534. The cubic root of 61951816 is about 395.6866037239.

The spelling of 61951816 in words is "sixty-one million, nine hundred fifty-one thousand, eight hundred sixteen".