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1315609 = 312372
BaseRepresentation
bin101000001001100011001
32110211200021
411001030121
5314044414
644110441
714116411
oct5011431
92424607
101315609
11819489
12535421
13370a89
14263641
151aec24
hex141319

1315609 has 9 divisors (see below), whose sum is σ = 1397151. Its totient is φ = 1238760.

The previous prime is 1315607. The next prime is 1315621. The reversal of 1315609 is 9065131.

The square root of 1315609 is 1147.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 138384 = 1085^2 + 372^2 .

It is not a de Polignac number, because 1315609 - 21 = 1315607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315603) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35539 + ... + 35575.

It is an arithmetic number, because the mean of its divisors is an integer number (155239).

21315609 is an apocalyptic number.

1315609 is the 1147-th square number.

1315609 is the 574-th centered octagonal number.

It is an amenable number.

1315609 is a deficient number, since it is larger than the sum of its proper divisors (81542).

1315609 is an frugal number, since it uses more digits than its factorization.

1315609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 25.

The cubic root of 1315609 is about 109.5743606443.

Multiplying 1315609 by its sum of digits (25), we get a square (32890225 = 57352).

The spelling of 1315609 in words is "one million, three hundred fifteen thousand, six hundred nine".

Divisors: 1 31 37 961 1147 1369 35557 42439 1315609