620976949 has 2 divisors, whose sum is σ = 620976950. Its totient is φ = 620976948.

The previous prime is 620976907. The next prime is 620976953. The reversal of 620976949 is 949679026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620906724 + 70225 = 24918^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 620976949 - 2⁷ = 620976821 is a prime.

It is a super-2 number, since 2×620976949² = 771224742378697202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 620976896 and 620976905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620956949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310488474 + 310488475.

It is an arithmetic number, because the mean of its divisors is an integer number (310488475).

Almost surely, 2^620976949 is an apocalyptic number.

It is an amenable number.

620976949 is a deficient number, since it is larger than the sum of its proper divisors (1).

620976949 is an equidigital number, since it uses as much as digits as its factorization.

620976949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 620976949 is about 24919.4090820790. The cubic root of 620976949 is about 853.1495376288.

The spelling of 620976949 in words is "six hundred twenty million, nine hundred seventy-six thousand, nine hundred forty-nine".