6420061 has 2 divisors, whose sum is σ = 6420062. Its totient is φ = 6420060.

The previous prime is 6420053. The next prime is 6420077. The reversal of 6420061 is 1600246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 219961 = 2490^2 + 469^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420061 - 2³ = 6420053 is a prime.

6420061 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210030 + 3210031.

It is an arithmetic number, because the mean of its divisors is an integer number (3210031).

Almost surely, 2^6420061 is an apocalyptic number.

It is an amenable number.

6420061 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420061 is an equidigital number, since it uses as much as digits as its factorization.

6420061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 6420061 is about 2533.7839292252. The cubic root of 6420061 is about 185.8573404114.

It can be divided in two parts, 64200 and 61, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 6420061 in words is "six million, four hundred twenty thousand, sixty-one".