61816997 has 16 divisors (see below), whose sum is σ = 68739840. Its totient is φ = 55123200.

The previous prime is 61816969. The next prime is 61817011. The reversal of 61816997 is 79961816.

61816997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61816997 - 2⁶ = 61816933 is a prime.

It is a super-2 number, since 2×61816997² = 7642682236196018, 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 (61816927) 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 15 ways as a sum of consecutive naturals, for example, 227972 + ... + 228242.

It is an arithmetic number, because the mean of its divisors is an integer number (4296240).

Almost surely, 2^61816997 is an apocalyptic number.

It is an amenable number.

61816997 is a deficient number, since it is larger than the sum of its proper divisors (6922843).

61816997 is a wasteful number, since it uses less digits than its factorization.

61816997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604.

The product of its digits is 163296, while the sum is 47.

The square root of 61816997 is about 7862.3785841182. The cubic root of 61816997 is about 395.3993653527.

The spelling of 61816997 in words is "sixty-one million, eight hundred sixteen thousand, nine hundred ninety-seven".