1649105431 has 2 divisors, whose sum is σ = 1649105432. Its totient is φ = 1649105430.

The previous prime is 1649105413. The next prime is 1649105443. The reversal of 1649105431 is 1345019461.

Together with previous prime (1649105413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649105431 is a prime.

It is a super-3 number, since 3×1649105431³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649105411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824552715 + 824552716.

It is an arithmetic number, because the mean of its divisors is an integer number (824552716).

Almost surely, 2^1649105431 is an apocalyptic number.

1649105431 is the 25684-th centered pentagonal number.

1649105431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649105431 is an equidigital number, since it uses as much as digits as its factorization.

1649105431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1649105431 is about 40609.1791470845. The cubic root of 1649105431 is about 1181.4521600345.

The spelling of 1649105431 in words is "one billion, six hundred forty-nine million, one hundred five thousand, four hundred thirty-one".