621448137 has 6 divisors (see below), whose sum is σ = 897647322. Its totient is φ = 414298752.

The previous prime is 621448099. The next prime is 621448151. The reversal of 621448137 is 731844126.

It can be written as a sum of positive squares in only one way, i.e., 414692496 + 206755641 = 20364^2 + 14379^2 .

It is not a de Polignac number, because 621448137 - 2⁸ = 621447881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621448837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34524888 + ... + 34524905.

It is an arithmetic number, because the mean of its divisors is an integer number (149607887).

Almost surely, 2^621448137 is an apocalyptic number.

It is an amenable number.

621448137 is a deficient number, since it is larger than the sum of its proper divisors (276199185).

621448137 is a wasteful number, since it uses less digits than its factorization.

621448137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69049799 (or 69049796 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 621448137 is about 24928.8615263513. The cubic root of 621448137 is about 853.3652687667.

The spelling of 621448137 in words is "six hundred twenty-one million, four hundred forty-eight thousand, one hundred thirty-seven".