1391291902226 has 4 divisors (see below), whose sum is σ = 2086937853342. Its totient is φ = 695645951112.

The previous prime is 1391291902223. The next prime is 1391291902241. The reversal of 1391291902226 is 6222091921931.

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

It can be written as a sum of positive squares in only one way, i.e., 816501996025 + 574789906201 = 903605^2 + 758149^2 .

It is not an unprimeable number, because it can be changed into a prime (1391291902223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347822975555 + ... + 347822975558.

Almost surely, 2^{1391291902226} is an apocalyptic number.

1391291902226 is a deficient number, since it is larger than the sum of its proper divisors (695645951116).

1391291902226 is an equidigital number, since it uses as much as digits as its factorization.

1391291902226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695645951115.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 1391291902226 in words is "one trillion, three hundred ninety-one billion, two hundred ninety-one million, nine hundred two thousand, two hundred twenty-six".