61123501 has 2 divisors, whose sum is σ = 61123502. Its totient is φ = 61123500.

The previous prime is 61123499. The next prime is 61123507. The reversal of 61123501 is 10532116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55145476 + 5978025 = 7426^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 61123501 - 2¹ = 61123499 is a prime.

Together with 61123499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61123507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30561750 + 30561751.

It is an arithmetic number, because the mean of its divisors is an integer number (30561751).

Almost surely, 2^61123501 is an apocalyptic number.

It is an amenable number.

61123501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61123501 is an equidigital number, since it uses as much as digits as its factorization.

61123501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 61123501 is about 7818.1520194992. The cubic root of 61123501 is about 393.9152011583.

Adding to 61123501 its reverse (10532116), we get a palindrome (71655617).

The spelling of 61123501 in words is "sixty-one million, one hundred twenty-three thousand, five hundred one".