61691769 has 6 divisors (see below), whose sum is σ = 89110346. Its totient is φ = 41127840.

The previous prime is 61691753. The next prime is 61691771. The reversal of 61691769 is 96719616.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 29030544 = 5715^2 + 5388^2 .

It is not a de Polignac number, because 61691769 - 2⁴ = 61691753 is a prime.

It is a super-2 number, since 2×61691769² = 7611748724698722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61691779) 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 in 5 ways as a sum of consecutive naturals, for example, 3427312 + ... + 3427329.

Almost surely, 2^61691769 is an apocalyptic number.

It is an amenable number.

61691769 is a deficient number, since it is larger than the sum of its proper divisors (27418577).

61691769 is a wasteful number, since it uses less digits than its factorization.

61691769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6854647 (or 6854644 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 61691769 is about 7854.4107990352. The cubic root of 61691769 is about 395.1321867047.

The spelling of 61691769 in words is "sixty-one million, six hundred ninety-one thousand, seven hundred sixty-nine".