61813447 has 2 divisors, whose sum is σ = 61813448. Its totient is φ = 61813446.

The previous prime is 61813429. The next prime is 61813457. The reversal of 61813447 is 74431816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61813447 - 2¹⁵ = 61780679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61813417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906723 + 30906724.

It is an arithmetic number, because the mean of its divisors is an integer number (30906724).

Almost surely, 2^61813447 is an apocalyptic number.

61813447 is a deficient number, since it is larger than the sum of its proper divisors (1).

61813447 is an equidigital number, since it uses as much as digits as its factorization.

61813447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 61813447 is about 7862.1528222237. The cubic root of 61813447 is about 395.3917962661.

The spelling of 61813447 in words is "sixty-one million, eight hundred thirteen thousand, four hundred forty-seven".