61961897 has 2 divisors, whose sum is σ = 61961898. Its totient is φ = 61961896.

The previous prime is 61961873. The next prime is 61961927. The reversal of 61961897 is 79816916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60590656 + 1371241 = 7784^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 61961897 - 2¹⁸ = 61699753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61961827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30980948 + 30980949.

It is an arithmetic number, because the mean of its divisors is an integer number (30980949).

Almost surely, 2^61961897 is an apocalyptic number.

It is an amenable number.

61961897 is a deficient number, since it is larger than the sum of its proper divisors (1).

61961897 is an equidigital number, since it uses as much as digits as its factorization.

61961897 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61961897 is about 7871.5879592367. The cubic root of 61961897 is about 395.7080650281.

The spelling of 61961897 in words is "sixty-one million, nine hundred sixty-one thousand, eight hundred ninety-seven".