1401551421 has 16 divisors (see below), whose sum is σ = 1955052288. Its totient is φ = 892179200.

The previous prime is 1401551413. The next prime is 1401551443. The reversal of 1401551421 is 1241551041.

It is a cyclic number.

It is not a de Polignac number, because 1401551421 - 2³ = 1401551413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1401551391 and 1401551400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401551401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115440 + ... + 127001.

It is an arithmetic number, because the mean of its divisors is an integer number (122190768).

Almost surely, 2^1401551421 is an apocalyptic number.

It is an amenable number.

1401551421 is a deficient number, since it is larger than the sum of its proper divisors (553500867).

1401551421 is a wasteful number, since it uses less digits than its factorization.

1401551421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242532.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1401551421 is about 37437.2998625702. The cubic root of 1401551421 is about 1119.1020175150.

The spelling of 1401551421 in words is "one billion, four hundred one million, five hundred fifty-one thousand, four hundred twenty-one".