61916399 has 4 divisors (see below), whose sum is σ = 62013336. Its totient is φ = 61819464.

The previous prime is 61916381. The next prime is 61916411. The reversal of 61916399 is 99361916.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61916399 - 2¹⁶ = 61850863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61916339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47504 + ... + 48789.

It is an arithmetic number, because the mean of its divisors is an integer number (15503334).

Almost surely, 2^61916399 is an apocalyptic number.

61916399 is a deficient number, since it is larger than the sum of its proper divisors (96937).

61916399 is an equidigital number, since it uses as much as digits as its factorization.

61916399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96936.

The product of its digits is 78732, while the sum is 44.

The square root of 61916399 is about 7868.6974144391. The cubic root of 61916399 is about 395.6111864898.

The spelling of 61916399 in words is "sixty-one million, nine hundred sixteen thousand, three hundred ninety-nine".