1426181691 has 32 divisors (see below), whose sum is σ = 2215249920. Its totient is φ = 807609600.

The previous prime is 1426181681. The next prime is 1426181693. The reversal of 1426181691 is 1961816241.

It is not a de Polignac number, because 1426181691 - 2²¹ = 1424084539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1426181693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5631 + ... + 53703.

It is an arithmetic number, because the mean of its divisors is an integer number (69226560).

Almost surely, 2^1426181691 is an apocalyptic number.

1426181691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1426181691 is a deficient number, since it is larger than the sum of its proper divisors (789068229).

1426181691 is a wasteful number, since it uses less digits than its factorization.

1426181691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48147.

The product of its digits is 20736, while the sum is 39.

The square root of 1426181691 is about 37764.8208124969. The cubic root of 1426181691 is about 1125.6195280031.

The spelling of 1426181691 in words is "one billion, four hundred twenty-six million, one hundred eighty-one thousand, six hundred ninety-one".