616401449 has 4 divisors (see below), whose sum is σ = 643201536. Its totient is φ = 589601364.

The previous prime is 616401391. The next prime is 616401469. The reversal of 616401449 is 944104616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616401449 - 2¹⁶ = 616335913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (616401469) 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, 13400009 + ... + 13400054.

It is an arithmetic number, because the mean of its divisors is an integer number (160800384).

Almost surely, 2^616401449 is an apocalyptic number.

It is an amenable number.

616401449 is a deficient number, since it is larger than the sum of its proper divisors (26800087).

616401449 is a wasteful number, since it uses less digits than its factorization.

616401449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26800086.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 616401449 is about 24827.4333953391. The cubic root of 616401449 is about 851.0489697739.

The spelling of 616401449 in words is "six hundred sixteen million, four hundred one thousand, four hundred forty-nine".