61416409 has 2 divisors, whose sum is σ = 61416410. Its totient is φ = 61416408.

The previous prime is 61416391. The next prime is 61416419. The reversal of 61416409 is 90461416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 20903184 = 6365^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 61416409 - 2²¹ = 59319257 is a prime.

It is not a weakly prime, because it can be changed into another prime (61416419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30708204 + 30708205.

It is an arithmetic number, because the mean of its divisors is an integer number (30708205).

Almost surely, 2^61416409 is an apocalyptic number.

It is an amenable number.

61416409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61416409 is an equidigital number, since it uses as much as digits as its factorization.

61416409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61416409 is about 7836.8621909537. The cubic root of 61416409 is about 394.5434216002.

The spelling of 61416409 in words is "sixty-one million, four hundred sixteen thousand, four hundred nine".