61428761 has 2 divisors, whose sum is σ = 61428762. Its totient is φ = 61428760.

The previous prime is 61428743. The next prime is 61428793. The reversal of 61428761 is 16782416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36228361 + 25200400 = 6019^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 61428761 - 2¹⁸ = 61166617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61421761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30714380 + 30714381.

It is an arithmetic number, because the mean of its divisors is an integer number (30714381).

Almost surely, 2^61428761 is an apocalyptic number.

It is an amenable number.

61428761 is a deficient number, since it is larger than the sum of its proper divisors (1).

61428761 is an equidigital number, since it uses as much as digits as its factorization.

61428761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 61428761 is about 7837.6502218458. The cubic root of 61428761 is about 394.5698698722.

The spelling of 61428761 in words is "sixty-one million, four hundred twenty-eight thousand, seven hundred sixty-one".