61813841 has 2 divisors, whose sum is σ = 61813842. Its totient is φ = 61813840.

The previous prime is 61813837. The next prime is 61813861. The reversal of 61813841 is 14831816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 13719616 = 6935^2 + 3704^2 .

It is a cyclic number.

It is not a de Polignac number, because 61813841 - 2² = 61813837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61813798 and 61813807.

It is not a weakly prime, because it can be changed into another prime (61813831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906920 + 30906921.

It is an arithmetic number, because the mean of its divisors is an integer number (30906921).

Almost surely, 2^61813841 is an apocalyptic number.

It is an amenable number.

61813841 is a deficient number, since it is larger than the sum of its proper divisors (1).

61813841 is an equidigital number, since it uses as much as digits as its factorization.

61813841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 61813841 is about 7862.1778789341. The cubic root of 61813841 is about 395.3926363424.

The spelling of 61813841 in words is "sixty-one million, eight hundred thirteen thousand, eight hundred forty-one".