1551356402 has 6 divisors (see below), whose sum is σ = 2327118159. Its totient is φ = 775650350.

The previous prime is 1551356383. The next prime is 1551356431. The reversal of 1551356402 is 2046531551.

It can be written as a sum of positive squares in only one way, i.e., 775678201 + 775678201 = 27851^2 + 27851^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=27851.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 41777 + ... + 69627.

Almost surely, 2^1551356402 is an apocalyptic number.

1551356402 is a deficient number, since it is larger than the sum of its proper divisors (775761757).

1551356402 is an frugal number, since it uses more digits than its factorization.

1551356402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55704 (or 27853 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1551356402 is about 39387.2619256531. The cubic root of 1551356402 is about 1157.6320109053.

Multiplying 1551356402 by its sum of digits (32), we get a square (49643404864 = 222808²).

Adding to 1551356402 its reverse (2046531551), we get a palindrome (3597887953).

The spelling of 1551356402 in words is "one billion, five hundred fifty-one million, three hundred fifty-six thousand, four hundred two".