655489901 has 4 divisors (see below), whose sum is σ = 715079904. Its totient is φ = 595899900.

The previous prime is 655489867. The next prime is 655489909. The reversal of 655489901 is 109984556.

It is a happy number.

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 655489901 - 2¹⁸ = 655227757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655489909) 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, 29794985 + ... + 29795006.

It is an arithmetic number, because the mean of its divisors is an integer number (178769976).

Almost surely, 2^655489901 is an apocalyptic number.

It is an amenable number.

655489901 is a deficient number, since it is larger than the sum of its proper divisors (59590003).

655489901 is a wasteful number, since it uses less digits than its factorization.

655489901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59590002.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 655489901 is about 25602.5370031956. The cubic root of 655489901 is about 868.6710237473.

The spelling of 655489901 in words is "six hundred fifty-five million, four hundred eighty-nine thousand, nine hundred one".