61143479 has 2 divisors, whose sum is σ = 61143480. Its totient is φ = 61143478.

The previous prime is 61143469. The next prime is 61143517. The reversal of 61143479 is 97434116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61143479 - 2¹² = 61139383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61143469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30571739 + 30571740.

It is an arithmetic number, because the mean of its divisors is an integer number (30571740).

Almost surely, 2^61143479 is an apocalyptic number.

61143479 is a deficient number, since it is larger than the sum of its proper divisors (1).

61143479 is an equidigital number, since it uses as much as digits as its factorization.

61143479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 61143479 is about 7819.4295827765. The cubic root of 61143479 is about 393.9581130800.

The spelling of 61143479 in words is "sixty-one million, one hundred forty-three thousand, four hundred seventy-nine".