61999997 has 2 divisors, whose sum is σ = 61999998. Its totient is φ = 61999996.

The previous prime is 61999967. The next prime is 62000009. The reversal of 61999997 is 79999916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61999876 + 121 = 7874^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 61999997 - 2¹⁸ = 61737853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61999967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30999998 + 30999999.

It is an arithmetic number, because the mean of its divisors is an integer number (30999999).

Almost surely, 2^61999997 is an apocalyptic number.

It is an amenable number.

61999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

61999997 is an equidigital number, since it uses as much as digits as its factorization.

61999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2480058, while the sum is 59.

The square root of 61999997 is about 7874.0076835116. The cubic root of 61999997 is about 395.7891545843.

The spelling of 61999997 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred ninety-seven".