61687253 has 2 divisors, whose sum is σ = 61687254. Its totient is φ = 61687252.

The previous prime is 61687217. The next prime is 61687259. The reversal of 61687253 is 35278616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61434244 + 253009 = 7838^2 + 503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61687253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61687259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30843626 + 30843627.

It is an arithmetic number, because the mean of its divisors is an integer number (30843627).

Almost surely, 2^61687253 is an apocalyptic number.

It is an amenable number.

61687253 is a deficient number, since it is larger than the sum of its proper divisors (1).

61687253 is an equidigital number, since it uses as much as digits as its factorization.

61687253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 61687253 is about 7854.1233119935. The cubic root of 61687253 is about 395.1225448971.

The spelling of 61687253 in words is "sixty-one million, six hundred eighty-seven thousand, two hundred fifty-three".