1401121811 has 2 divisors, whose sum is σ = 1401121812. Its totient is φ = 1401121810.

The previous prime is 1401121789. The next prime is 1401121829. The reversal of 1401121811 is 1181211041.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1401121811 - 2²² = 1396927507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1401121411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700560905 + 700560906.

It is an arithmetic number, because the mean of its divisors is an integer number (700560906).

Almost surely, 2^1401121811 is an apocalyptic number.

1401121811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401121811 is an equidigital number, since it uses as much as digits as its factorization.

1401121811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 1401121811 is about 37431.5616959806. The cubic root of 1401121811 is about 1118.9876617275.

Adding to 1401121811 its reverse (1181211041), we get a palindrome (2582332852).

The spelling of 1401121811 in words is "one billion, four hundred one million, one hundred twenty-one thousand, eight hundred eleven".