6401569 has 2 divisors, whose sum is σ = 6401570. Its totient is φ = 6401568.

The previous prime is 6401557. The next prime is 6401579. The reversal of 6401569 is 9651046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 374544 = 2455^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401569 - 2¹¹ = 6399521 is a prime.

It is a super-2 number, since 2×6401569² = 81960171323522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6401569.

It is not a weakly prime, because it can be changed into another prime (6401509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200784 + 3200785.

It is an arithmetic number, because the mean of its divisors is an integer number (3200785).

Almost surely, 2^6401569 is an apocalyptic number.

It is an amenable number.

6401569 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401569 is an equidigital number, since it uses as much as digits as its factorization.

6401569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6401569 is about 2530.1322099843. The cubic root of 6401569 is about 185.6787242983.

It can be divided in two parts, 640 and 1569, that added together give a square (2209 = 47²).

The spelling of 6401569 in words is "six million, four hundred one thousand, five hundred sixty-nine".