1245631 has 4 divisors (see below), whose sum is σ = 1252152. Its totient is φ = 1239112.

The previous prime is 1245623. The next prime is 1245649. The reversal of 1245631 is 1365421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1365421 = 617 ⋅2213.

It is a cyclic number.

It is not a de Polignac number, because 1245631 - 2³ = 1245623 is a prime.

It is a super-2 number, since 2×1245631² = 3103193176322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965 + ... + 3358.

It is an arithmetic number, because the mean of its divisors is an integer number (313038).

2^1245631 is an apocalyptic number.

1245631 is a deficient number, since it is larger than the sum of its proper divisors (6521).

1245631 is an equidigital number, since it uses as much as digits as its factorization.

1245631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520.

The product of its digits is 720, while the sum is 22.

The square root of 1245631 is about 1116.0784022639. The cubic root of 1245631 is about 107.5960849955.

The spelling of 1245631 in words is "one million, two hundred forty-five thousand, six hundred thirty-one".