1551551156 has 12 divisors (see below), whose sum is σ = 2808842820. Its totient is φ = 749024640.

The previous prime is 1551551101. The next prime is 1551551171. The reversal of 1551551156 is 6511551551.

It can be written as a sum of positive squares in 2 ways, for example, as 989102500 + 562448656 = 31450^2 + 23716^2 .

It is a congruent number.

It is an unprimeable number.

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, 6687605 + ... + 6687836.

It is an arithmetic number, because the mean of its divisors is an integer number (234070235).

Almost surely, 2^1551551156 is an apocalyptic number.

It is an amenable number.

1551551156 is a deficient number, since it is larger than the sum of its proper divisors (1257291664).

1551551156 is a wasteful number, since it uses less digits than its factorization.

1551551156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13375474 (or 13375472 counting only the distinct ones).

The product of its digits is 18750, while the sum is 35.

The square root of 1551551156 is about 39389.7341448251. The cubic root of 1551551156 is about 1157.6804511027.

The spelling of 1551551156 in words is "one billion, five hundred fifty-one million, five hundred fifty-one thousand, one hundred fifty-six".