621649337 has 4 divisors (see below), whose sum is σ = 621879696. Its totient is φ = 621418980.

The previous prime is 621649297. The next prime is 621649351. The reversal of 621649337 is 733946126.

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 621649337 - 2¹⁴ = 621632953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621649294 and 621649303.

It is not an unprimeable number, because it can be changed into a prime (621649367) 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, 111083 + ... + 116544.

It is an arithmetic number, because the mean of its divisors is an integer number (155469924).

Almost surely, 2^621649337 is an apocalyptic number.

It is an amenable number.

621649337 is a deficient number, since it is larger than the sum of its proper divisors (230359).

621649337 is a wasteful number, since it uses less digits than its factorization.

621649337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230358.

The product of its digits is 163296, while the sum is 41.

The square root of 621649337 is about 24932.8966828967. The cubic root of 621649337 is about 853.4573539870.

The spelling of 621649337 in words is "six hundred twenty-one million, six hundred forty-nine thousand, three hundred thirty-seven".