61864919 has 8 divisors (see below), whose sum is σ = 63821808. Its totient is φ = 59938560.

The previous prime is 61864909. The next prime is 61864961. The reversal of 61864919 is 91946816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61864919 is a prime.

It is a super-2 number, since 2×61864919² = 7654536405753122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61864919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61864909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3482 + ... + 11655.

It is an arithmetic number, because the mean of its divisors is an integer number (7977726).

Almost surely, 2^61864919 is an apocalyptic number.

61864919 is a deficient number, since it is larger than the sum of its proper divisors (1956889).

61864919 is a wasteful number, since it uses less digits than its factorization.

61864919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15265.

The product of its digits is 93312, while the sum is 44.

The square root of 61864919 is about 7865.4255447496. The cubic root of 61864919 is about 395.5015132787.

The spelling of 61864919 in words is "sixty-one million, eight hundred sixty-four thousand, nine hundred nineteen".