1631345 has 8 divisors (see below), whose sum is σ = 1964520. Its totient is φ = 1300480.

The previous prime is 1631341. The next prime is 1631351. The reversal of 1631345 is 5431361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 717409 + 913936 = 847^2 + 956^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1631345 - 2² = 1631341 is a prime.

It is a super-2 number, since 2×1631345² = 5322573018050, 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 1631345.

It is not an unprimeable number, because it can be changed into a prime (1631341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225 + ... + 2865.

It is an arithmetic number, because the mean of its divisors is an integer number (245565).

2^1631345 is an apocalyptic number.

It is an amenable number.

1631345 is a deficient number, since it is larger than the sum of its proper divisors (333175).

1631345 is an equidigital number, since it uses as much as digits as its factorization.

1631345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155.

The product of its digits is 1080, while the sum is 23.

The square root of 1631345 is about 1277.2411675169. The cubic root of 1631345 is about 117.7195532852.

The spelling of 1631345 in words is "one million, six hundred thirty-one thousand, three hundred forty-five".