61511953 has 2 divisors, whose sum is σ = 61511954. Its totient is φ = 61511952.

The previous prime is 61511951. The next prime is 61511969. The reversal of 61511953 is 35911516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55100929 + 6411024 = 7423^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 61511953 - 2¹ = 61511951 is a prime.

Together with 61511951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61511951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755976 + 30755977.

It is an arithmetic number, because the mean of its divisors is an integer number (30755977).

Almost surely, 2^61511953 is an apocalyptic number.

It is an amenable number.

61511953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511953 is an equidigital number, since it uses as much as digits as its factorization.

61511953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050, while the sum is 31.

The square root of 61511953 is about 7842.9556290980. The cubic root of 61511953 is about 394.7479094369.

The spelling of 61511953 in words is "sixty-one million, five hundred eleven thousand, nine hundred fifty-three".