201091930 has 16 divisors (see below), whose sum is σ = 389809224. Its totient is φ = 74249280.

The previous prime is 201091907. The next prime is 201091937. The reversal of 201091930 is 39190102.

It can be written as a sum of positive squares in 4 ways, for example, as 139736041 + 61355889 = 11821^2 + 7833^2 .

It is a super-2 number, since 2×201091930² = 80875928622249800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201091895 and 201091904.

It is not an unprimeable number, because it can be changed into a prime (201091937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773301 + ... + 773560.

Almost surely, 2^201091930 is an apocalyptic number.

201091930 is a deficient number, since it is larger than the sum of its proper divisors (188717294).

201091930 is a wasteful number, since it uses less digits than its factorization.

201091930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546881.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 201091930 is about 14180.6886292592. The cubic root of 201091930 is about 585.8658908707.

The spelling of 201091930 in words is "two hundred one million, ninety-one thousand, nine hundred thirty".