1564261 has 4 divisors (see below), whose sum is σ = 1579552. Its totient is φ = 1548972.

The previous prime is 1564243. The next prime is 1564307. The reversal of 1564261 is 1624651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1564261 - 2¹³ = 1556069 is a prime.

It is a super-2 number, since 2×1564261² = 4893824952242, which contains 22 as substring.

It is a Duffinian number.

1564261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7491 + ... + 7696.

It is an arithmetic number, because the mean of its divisors is an integer number (394888).

2^1564261 is an apocalyptic number.

It is an amenable number.

1564261 is a deficient number, since it is larger than the sum of its proper divisors (15291).

1564261 is a wasteful number, since it uses less digits than its factorization.

1564261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15290.

The product of its digits is 1440, while the sum is 25.

The square root of 1564261 is about 1250.7042016400. The cubic root of 1564261 is about 116.0832982756.

The spelling of 1564261 in words is "one million, five hundred sixty-four thousand, two hundred sixty-one".