61123813 has 2 divisors, whose sum is σ = 61123814. Its totient is φ = 61123812.

The previous prime is 61123807. The next prime is 61123819. The reversal of 61123813 is 31832116.

It is a balanced prime because it is at equal distance from previous prime (61123807) and next prime (61123819).

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 18378369 = 6538^2 + 4287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61123813 is a prime.

It is a super-2 number, since 2×61123813² = 7472241031317938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61123819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30561906 + 30561907.

It is an arithmetic number, because the mean of its divisors is an integer number (30561907).

Almost surely, 2^61123813 is an apocalyptic number.

It is an amenable number.

61123813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61123813 is an equidigital number, since it uses as much as digits as its factorization.

61123813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 61123813 is about 7818.1719730382. The cubic root of 61123813 is about 393.9158713933.

Adding to 61123813 its reverse (31832116), we get a palindrome (92955929).

The spelling of 61123813 in words is "sixty-one million, one hundred twenty-three thousand, eight hundred thirteen".