61011961 has 2 divisors, whose sum is σ = 61011962. Its totient is φ = 61011960.

The previous prime is 61011953. The next prime is 61011989. The reversal of 61011961 is 16911016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59675625 + 1336336 = 7725^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 61011961 - 2³ = 61011953 is a prime.

It is not a weakly prime, because it can be changed into another prime (61011901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30505980 + 30505981.

It is an arithmetic number, because the mean of its divisors is an integer number (30505981).

Almost surely, 2^61011961 is an apocalyptic number.

It is an amenable number.

61011961 is a deficient number, since it is larger than the sum of its proper divisors (1).

61011961 is an equidigital number, since it uses as much as digits as its factorization.

61011961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 61011961 is about 7811.0153629346. The cubic root of 61011961 is about 393.6754458324.

Adding to 61011961 its reverse (16911016), we get a palindrome (77922977).

The spelling of 61011961 in words is "sixty-one million, eleven thousand, nine hundred sixty-one".