621011051 has 4 divisors (see below), whose sum is σ = 636157704. Its totient is φ = 605864400.

The previous prime is 621011033. The next prime is 621011089. The reversal of 621011051 is 150110126.

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 621011051 - 2¹⁴ = 620994667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621011011) 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 3 ways as a sum of consecutive naturals, for example, 7573265 + ... + 7573346.

It is an arithmetic number, because the mean of its divisors is an integer number (159039426).

Almost surely, 2^621011051 is an apocalyptic number.

621011051 is a deficient number, since it is larger than the sum of its proper divisors (15146653).

621011051 is a wasteful number, since it uses less digits than its factorization.

621011051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15146652.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 621011051 is about 24920.0933184449. The cubic root of 621011051 is about 853.1651547264.

Adding to 621011051 its reverse (150110126), we get a palindrome (771121177).

The spelling of 621011051 in words is "six hundred twenty-one million, eleven thousand, fifty-one".