61816969 has 2 divisors, whose sum is σ = 61816970. Its totient is φ = 61816968.

The previous prime is 61816967. The next prime is 61817011. The reversal of 61816969 is 96961816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54952569 + 6864400 = 7413^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 61816969 - 2¹ = 61816967 is a prime.

It is a super-2 number, since 2×61816969² = 7642675312693922, which contains 22 as substring.

Together with 61816967, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (61816961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30908484 + 30908485.

It is an arithmetic number, because the mean of its divisors is an integer number (30908485).

Almost surely, 2^61816969 is an apocalyptic number.

It is an amenable number.

61816969 is a deficient number, since it is larger than the sum of its proper divisors (1).

61816969 is an equidigital number, since it uses as much as digits as its factorization.

61816969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 61816969 is about 7862.3768034863. The cubic root of 61816969 is about 395.3993056540.

The spelling of 61816969 in words is "sixty-one million, eight hundred sixteen thousand, nine hundred sixty-nine".