61428959 has 2 divisors, whose sum is σ = 61428960. Its totient is φ = 61428958.

The previous prime is 61428923. The next prime is 61428967. The reversal of 61428959 is 95982416.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61428959 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 (61428979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30714479 + 30714480.

It is an arithmetic number, because the mean of its divisors is an integer number (30714480).

Almost surely, 2^61428959 is an apocalyptic number.

61428959 is a deficient number, since it is larger than the sum of its proper divisors (1).

61428959 is an equidigital number, since it uses as much as digits as its factorization.

61428959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 61428959 is about 7837.6628531725. The cubic root of 61428959 is about 394.5702938037.

The spelling of 61428959 in words is "sixty-one million, four hundred twenty-eight thousand, nine hundred fifty-nine".