628131941 has 4 divisors (see below), whose sum is σ = 629996172. Its totient is φ = 626267712.

The previous prime is 628131937. The next prime is 628131949. The reversal of 628131941 is 149131826.

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

It can be written as a sum of positive squares in 2 ways, for example, as 184144900 + 443987041 = 13570^2 + 21071^2 .

It is a cyclic number.

It is not a de Polignac number, because 628131941 - 2² = 628131937 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628131949) 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, 931610 + ... + 932283.

It is an arithmetic number, because the mean of its divisors is an integer number (157499043).

Almost surely, 2^628131941 is an apocalyptic number.

It is an amenable number.

628131941 is a deficient number, since it is larger than the sum of its proper divisors (1864231).

628131941 is a wasteful number, since it uses less digits than its factorization.

628131941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864230.

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

The square root of 628131941 is about 25062.5605435678. The cubic root of 628131941 is about 856.4137394360.

The spelling of 628131941 in words is "six hundred twenty-eight million, one hundred thirty-one thousand, nine hundred forty-one".