620618749 has 2 divisors, whose sum is σ = 620618750. Its totient is φ = 620618748.

The previous prime is 620618743. The next prime is 620618759. The reversal of 620618749 is 947816026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620358649 + 260100 = 24907^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 620618749 - 2³ = 620618741 is a prime.

It is a super-2 number, since 2×620618749² = 770335263220650002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620618741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310309374 + 310309375.

It is an arithmetic number, because the mean of its divisors is an integer number (310309375).

Almost surely, 2^620618749 is an apocalyptic number.

It is an amenable number.

620618749 is a deficient number, since it is larger than the sum of its proper divisors (1).

620618749 is an equidigital number, since it uses as much as digits as its factorization.

620618749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 620618749 is about 24912.2208765096. The cubic root of 620618749 is about 852.9854644731.

It can be divided in two parts, 620 and 618749, that added together give a square (619369 = 787²).

The spelling of 620618749 in words is "six hundred twenty million, six hundred eighteen thousand, seven hundred forty-nine".