61820297 has 32 divisors (see below), whose sum is σ = 81782784. Its totient is φ = 45302400.

The previous prime is 61820273. The next prime is 61820321. The reversal of 61820297 is 79202816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61820273) and next prime (61820321).

It is not a de Polignac number, because 61820297 - 2⁶ = 61820233 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61820797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118397 + ... + 118917.

It is an arithmetic number, because the mean of its divisors is an integer number (2555712).

Almost surely, 2^61820297 is an apocalyptic number.

61820297 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

61820297 is a deficient number, since it is larger than the sum of its proper divisors (19962487).

61820297 is a wasteful number, since it uses less digits than its factorization.

61820297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 61820297 is about 7862.5884414740. The cubic root of 61820297 is about 395.4064011452.

The spelling of 61820297 in words is "sixty-one million, eight hundred twenty thousand, two hundred ninety-seven".