649206541 has 4 divisors (see below), whose sum is σ = 649463584. Its totient is φ = 648949500.

The previous prime is 649206539. The next prime is 649206553. The reversal of 649206541 is 145602946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649206541 - 2¹ = 649206539 is a prime.

It is a super-3 number, since 3×649206541³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649206541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649206511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124695 + ... + 129796.

It is an arithmetic number, because the mean of its divisors is an integer number (162365896).

Almost surely, 2^649206541 is an apocalyptic number.

It is an amenable number.

649206541 is a deficient number, since it is larger than the sum of its proper divisors (257043).

649206541 is a wasteful number, since it uses less digits than its factorization.

649206541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257042.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 649206541 is about 25479.5318049606. The cubic root of 649206541 is about 865.8864873521.

The spelling of 649206541 in words is "six hundred forty-nine million, two hundred six thousand, five hundred forty-one".