201291309026 has 4 divisors (see below), whose sum is σ = 301936963542. Its totient is φ = 100645654512.

The previous prime is 201291309017. The next prime is 201291309049. The reversal of 201291309026 is 620903192102.

It is a Cunningham number, because it is equal to 448655²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 620903192102 = 2 ⋅310451596051.

It can be written as a sum of positive squares in only one way, i.e., 201291309025 + 1 = 448655^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50322827255 + ... + 50322827258.

Almost surely, 2^201291309026 is an apocalyptic number.

201291309026 is a deficient number, since it is larger than the sum of its proper divisors (100645654516).

201291309026 is a wasteful number, since it uses less digits than its factorization.

201291309026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100645654515.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 201291309026 in words is "two hundred one billion, two hundred ninety-one million, three hundred nine thousand, twenty-six".