621139 has 2 divisors, whose sum is σ = 621140. Its totient is φ = 621138.

The previous prime is 621133. The next prime is 621143. The reversal of 621139 is 931126.

621139 = T₆₄₂ + T₆₄₃ + T₆₄₄.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621139 - 2¹³ = 612947 is a prime.

It is not a weakly prime, because it can be changed into another prime (621133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310569 + 310570.

It is an arithmetic number, because the mean of its divisors is an integer number (310570).

2⁶²¹¹³⁹ is an apocalyptic number.

621139 is the 644-th centered triangular number.

621139 is a deficient number, since it is larger than the sum of its proper divisors (1).

621139 is an equidigital number, since it uses as much as digits as its factorization.

621139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 621139 is about 788.1237212519. The cubic root of 621139 is about 85.3223744200.

The spelling of 621139 in words is "six hundred twenty-one thousand, one hundred thirty-nine".