1551780980 has 12 divisors (see below), whose sum is σ = 3258740100. Its totient is φ = 620712384.

The previous prime is 1551780973. The next prime is 1551780983. The reversal of 1551780980 is 890871551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 593507044 + 958273936 = 24362^2 + 30956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551780983) 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, 38794505 + ... + 38794544.

It is an arithmetic number, because the mean of its divisors is an integer number (271561675).

Almost surely, 2^1551780980 is an apocalyptic number.

1551780980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551780980 is an abundant number, since it is smaller than the sum of its proper divisors (1706959120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551780980 is a wasteful number, since it uses less digits than its factorization.

1551780980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77589058 (or 77589056 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 44.

The square root of 1551780980 is about 39392.6513451430. The cubic root of 1551780980 is about 1157.7376088735.

The spelling of 1551780980 in words is "one billion, five hundred fifty-one million, seven hundred eighty thousand, nine hundred eighty".