61996619 has 4 divisors (see below), whose sum is σ = 63315744.
Its totient is φ = 60677496.
The previous prime is 61996609. The next prime is 61996657. The reversal of 61996619 is 91669916.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-61996619 is a prime.
It is a super-2 number, since 2×619966192 = 7687161534862322, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1319077 = 61996619 / (6 + 1 + 9 + 9 + 6 + 6 + 1 + 9).
61996619 is a strobogrammatic number because it is the same when read upside-down.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (61996609) 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 3 ways as a sum of consecutive naturals, for example, 659492 + ... + 659585.
It is an arithmetic number, because the mean of its divisors is an integer number (15828936).
Almost surely, 261996619 is an apocalyptic number.
61996619 is a deficient number, since it is larger than the sum of its proper divisors (1319125).
61996619 is a wasteful number, since it uses less digits than its factorization.
61996619 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1319124.
The product of its digits is 157464, while the sum is 47.
The square root of 61996619 is about 7873.7931773701.
The cubic root of 61996619 is about 395.7819664117.
The spelling of 61996619 in words is "sixty-one million, nine hundred ninety-six thousand, six hundred nineteen".