649540031 has 12 divisors (see below), whose sum is σ = 756101808. Its totient is φ = 556369632.

The previous prime is 649539997. The next prime is 649540093. The reversal of 649540031 is 130045946.

It is not a de Polignac number, because 649540031 - 2⁶ = 649539967 is a prime.

It is a super-2 number, since 2×649540031² = 843804503742961922, 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 649540031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649560031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86915 + ... + 94091.

It is an arithmetic number, because the mean of its divisors is an integer number (63008484).

Almost surely, 2^649540031 is an apocalyptic number.

649540031 is a deficient number, since it is larger than the sum of its proper divisors (106561777).

649540031 is a wasteful number, since it uses less digits than its factorization.

649540031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9038 (or 9031 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 649540031 is about 25486.0752372742. The cubic root of 649540031 is about 866.0347273115.

Adding to 649540031 its reverse (130045946), we get a palindrome (779585977).

The spelling of 649540031 in words is "six hundred forty-nine million, five hundred forty thousand, thirty-one".