621145634 has 4 divisors (see below), whose sum is σ = 931718454. Its totient is φ = 310572816.

The previous prime is 621145633. The next prime is 621145639. The reversal of 621145634 is 436541126.

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

It can be written as a sum of positive squares in only one way, i.e., 399880009 + 221265625 = 19997^2 + 14875^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 621145634.

It is not an unprimeable number, because it can be changed into a prime (621145633) 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 as a sum of consecutive naturals, namely, 155286407 + ... + 155286410.

Almost surely, 2^621145634 is an apocalyptic number.

621145634 is a deficient number, since it is larger than the sum of its proper divisors (310572820).

621145634 is a wasteful number, since it uses less digits than its factorization.

621145634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310572819.

The product of its digits is 17280, while the sum is 32.

The square root of 621145634 is about 24922.7934630129. The cubic root of 621145634 is about 853.2267817738.

The spelling of 621145634 in words is "six hundred twenty-one million, one hundred forty-five thousand, six hundred thirty-four".