61351669 has 6 divisors (see below), whose sum is σ = 62813526. Its totient is φ = 59923080.

The previous prime is 61351663. The next prime is 61351673. The reversal of 61351669 is 96615316.

It can be written as a sum of positive squares in only one way, i.e., 50951044 + 10400625 = 7138^2 + 3225^2 .

It is not a de Polignac number, because 61351669 - 2¹⁷ = 61220597 is a prime.

It is a super-2 number, since 2×61351669² = 7528054578171122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14742 + ... + 18439.

It is an arithmetic number, because the mean of its divisors is an integer number (10468921).

Almost surely, 2^61351669 is an apocalyptic number.

It is an amenable number.

61351669 is a deficient number, since it is larger than the sum of its proper divisors (1461857).

61351669 is an equidigital number, since it uses as much as digits as its factorization.

61351669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33267 (or 33224 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 61351669 is about 7832.7306222032. The cubic root of 61351669 is about 394.4047413909.

The spelling of 61351669 in words is "sixty-one million, three hundred fifty-one thousand, six hundred sixty-nine".