609651591 has 16 divisors (see below), whose sum is σ = 833457408. Its totient is φ = 396158400.

The previous prime is 609651583. The next prime is 609651607. The reversal of 609651591 is 195156906.

It is not a de Polignac number, because 609651591 - 2³ = 609651583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609651521) 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, 223860 + ... + 226566.

It is an arithmetic number, because the mean of its divisors is an integer number (52091088).

Almost surely, 2^609651591 is an apocalyptic number.

609651591 is a deficient number, since it is larger than the sum of its proper divisors (223805817).

609651591 is a wasteful number, since it uses less digits than its factorization.

609651591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4582.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 609651591 is about 24691.1237289841. The cubic root of 609651591 is about 847.9311119243.

The spelling of 609651591 in words is "six hundred nine million, six hundred fifty-one thousand, five hundred ninety-one".