61989953 has 2 divisors, whose sum is σ = 61989954. Its totient is φ = 61989952.

The previous prime is 61989937. The next prime is 61989959. The reversal of 61989953 is 35998916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 26801329 = 5932^2 + 5177^2 .

It is a cyclic number.

It is not a de Polignac number, because 61989953 - 2⁴ = 61989937 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61989959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30994976 + 30994977.

It is an arithmetic number, because the mean of its divisors is an integer number (30994977).

Almost surely, 2^61989953 is an apocalyptic number.

It is an amenable number.

61989953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61989953 is an equidigital number, since it uses as much as digits as its factorization.

61989953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 61989953 is about 7873.3698630256. The cubic root of 61989953 is about 395.7677808147.

The spelling of 61989953 in words is "sixty-one million, nine hundred eighty-nine thousand, nine hundred fifty-three".