1291422952826 has 4 divisors (see below), whose sum is σ = 1937134429242. Its totient is φ = 645711476412.

The previous prime is 1291422952789. The next prime is 1291422952829. The reversal of 1291422952826 is 6282592241921.

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., 1157356398025 + 134066554801 = 1075805^2 + 366151^2 .

It is not an unprimeable number, because it can be changed into a prime (1291422952829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322855738205 + ... + 322855738208.

Almost surely, 2^{1291422952826} is an apocalyptic number.

1291422952826 is a deficient number, since it is larger than the sum of its proper divisors (645711476416).

1291422952826 is an equidigital number, since it uses as much as digits as its factorization.

1291422952826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645711476415.

The product of its digits is 2488320, while the sum is 53.

The spelling of 1291422952826 in words is "one trillion, two hundred ninety-one billion, four hundred twenty-two million, nine hundred fifty-two thousand, eight hundred twenty-six".