1405406551 has 4 divisors (see below), whose sum is σ = 1406488104. Its totient is φ = 1404325000.

The previous prime is 1405406543. The next prime is 1405406657. The reversal of 1405406551 is 1556045041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1556045041 = 137 ⋅11357993.

It is a cyclic number.

It is not a de Polignac number, because 1405406551 - 2³ = 1405406543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405406521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538825 + ... + 541426.

It is an arithmetic number, because the mean of its divisors is an integer number (351622026).

Almost surely, 2^1405406551 is an apocalyptic number.

1405406551 is a deficient number, since it is larger than the sum of its proper divisors (1081553).

1405406551 is a wasteful number, since it uses less digits than its factorization.

1405406551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081552.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1405406551 is about 37488.7523265312. The cubic root of 1405406551 is about 1120.1271515399.

The spelling of 1405406551 in words is "one billion, four hundred five million, four hundred six thousand, five hundred fifty-one".