2045631 has 16 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 1128288.

The previous prime is 2045629. The next prime is 2045647. The reversal of 2045631 is 1365402.

It is a happy number.

It is not a de Polignac number, because 2045631 - 2¹ = 2045629 is a prime.

It is a super-2 number, since 2×2045631² = 8369212376322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 2045598 and 2045607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1071 + ... + 2288.

It is an arithmetic number, because the mean of its divisors is an integer number (201600).

2^2045631 is an apocalyptic number.

2045631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2045631 is a deficient number, since it is larger than the sum of its proper divisors (1179969).

2045631 is a wasteful number, since it uses less digits than its factorization.

2045631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2045631 is about 1430.2555715675. The cubic root of 2045631 is about 126.9430997302.

The spelling of 2045631 in words is "two million, forty-five thousand, six hundred thirty-one".