61518953 has 2 divisors, whose sum is σ = 61518954. Its totient is φ = 61518952.

The previous prime is 61518929. The next prime is 61518991. The reversal of 61518953 is 35981516.

It is an a-pointer prime, because the next prime (61518991) can be obtained adding 61518953 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36638809 + 24880144 = 6053^2 + 4988^2 .

It is a cyclic number.

It is not a de Polignac number, because 61518953 - 2²² = 57324649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61518923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30759476 + 30759477.

It is an arithmetic number, because the mean of its divisors is an integer number (30759477).

Almost surely, 2^61518953 is an apocalyptic number.

It is an amenable number.

61518953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61518953 is an equidigital number, since it uses as much as digits as its factorization.

61518953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 61518953 is about 7843.4018767369. The cubic root of 61518953 is about 394.7628828441.

The spelling of 61518953 in words is "sixty-one million, five hundred eighteen thousand, nine hundred fifty-three".