61879669 has 2 divisors, whose sum is σ = 61879670. Its totient is φ = 61879668.

The previous prime is 61879667. The next prime is 61879687. The reversal of 61879669 is 96697816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61826769 + 52900 = 7863^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 61879669 - 2¹ = 61879667 is a prime.

It is a super-2 number, since 2×61879669² = 7658186871099122, which contains 22 as substring.

Together with 61879667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61879661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30939834 + 30939835.

It is an arithmetic number, because the mean of its divisors is an integer number (30939835).

Almost surely, 2^61879669 is an apocalyptic number.

It is an amenable number.

61879669 is a deficient number, since it is larger than the sum of its proper divisors (1).

61879669 is an equidigital number, since it uses as much as digits as its factorization.

61879669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 61879669 is about 7866.3631367996. The cubic root of 61879669 is about 395.5329429583.

The spelling of 61879669 in words is "sixty-one million, eight hundred seventy-nine thousand, six hundred sixty-nine".