1401220171156 has 24 divisors (see below), whose sum is σ = 2643758636904. Its totient is φ = 645982909440.

The previous prime is 1401220171139. The next prime is 1401220171189. The reversal of 1401220171156 is 6511710221041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36602500 + 1401183568656 = 6050^2 + 1183716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15247345 + ... + 15338968.

It is an arithmetic number, because the mean of its divisors is an integer number (110156609871).

Almost surely, 2^{1401220171156} is an apocalyptic number.

It is an amenable number.

1401220171156 is a deficient number, since it is larger than the sum of its proper divisors (1242538465748).

1401220171156 is a wasteful number, since it uses less digits than its factorization.

1401220171156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30587211 (or 30587209 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 1401220171156 its reverse (6511710221041), we get a palindrome (7912930392197).

The spelling of 1401220171156 in words is "one trillion, four hundred one billion, two hundred twenty million, one hundred seventy-one thousand, one hundred fifty-six".