628209161 has 4 divisors (see below), whose sum is σ = 629279952. Its totient is φ = 627138372.

The previous prime is 628209137. The next prime is 628209209. The reversal of 628209161 is 161902826.

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 a de Polignac number, because none of the positive numbers 2^k-628209161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628209121) 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, 534515 + ... + 535688.

It is an arithmetic number, because the mean of its divisors is an integer number (157319988).

Almost surely, 2^628209161 is an apocalyptic number.

It is an amenable number.

628209161 is a deficient number, since it is larger than the sum of its proper divisors (1070791).

628209161 is a wasteful number, since it uses less digits than its factorization.

628209161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070790.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 628209161 is about 25064.1010411305. The cubic root of 628209161 is about 856.4488326783.

The spelling of 628209161 in words is "six hundred twenty-eight million, two hundred nine thousand, one hundred sixty-one".