61129687 has 2 divisors, whose sum is σ = 61129688. Its totient is φ = 61129686.

The previous prime is 61129681. The next prime is 61129693. The reversal of 61129687 is 78692116.

It is a balanced prime because it is at equal distance from previous prime (61129681) and next prime (61129693).

It is a cyclic number.

It is not a de Polignac number, because 61129687 - 2²³ = 52741079 is a prime.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61129681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30564843 + 30564844.

It is an arithmetic number, because the mean of its divisors is an integer number (30564844).

Almost surely, 2^61129687 is an apocalyptic number.

61129687 is a deficient number, since it is larger than the sum of its proper divisors (1).

61129687 is an equidigital number, since it uses as much as digits as its factorization.

61129687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 61129687 is about 7818.5476272771. The cubic root of 61129687 is about 393.9284894309.

It can be divided in two parts, 61129 and 687, that added together give a palindrome (61816).

The spelling of 61129687 in words is "sixty-one million, one hundred twenty-nine thousand, six hundred eighty-seven".