650409091 has 4 divisors (see below), whose sum is σ = 651961800. Its totient is φ = 648856384.

The previous prime is 650409073. The next prime is 650409107. The reversal of 650409091 is 190904056.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 650409091 - 2⁷ = 650408963 is a prime.

It is a super-5 number, since 5×650409091⁵ (a number of 45 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650409041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775726 + ... + 776563.

It is an arithmetic number, because the mean of its divisors is an integer number (162990450).

Almost surely, 2^650409091 is an apocalyptic number.

650409091 is a deficient number, since it is larger than the sum of its proper divisors (1552709).

650409091 is a wasteful number, since it uses less digits than its factorization.

650409091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552708.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 650409091 is about 25503.1192405949. The cubic root of 650409091 is about 866.4207957534.

The spelling of 650409091 in words is "six hundred fifty million, four hundred nine thousand, ninety-one".