61719953 has 2 divisors, whose sum is σ = 61719954. Its totient is φ = 61719952.

The previous prime is 61719947. The next prime is 61719991. The reversal of 61719953 is 35991716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61653904 + 66049 = 7852^2 + 257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61719953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61719953.

It is not a weakly prime, because it can be changed into another prime (61719943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30859976 + 30859977.

It is an arithmetic number, because the mean of its divisors is an integer number (30859977).

Almost surely, 2^61719953 is an apocalyptic number.

It is an amenable number.

61719953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61719953 is an equidigital number, since it uses as much as digits as its factorization.

61719953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 41.

The square root of 61719953 is about 7856.2047452953. The cubic root of 61719953 is about 395.1923498365.

The spelling of 61719953 in words is "sixty-one million, seven hundred nineteen thousand, nine hundred fifty-three".