1551680897 has 4 divisors (see below), whose sum is σ = 1671040980. Its totient is φ = 1432320816.

The previous prime is 1551680887. The next prime is 1551680909. The reversal of 1551680897 is 7980861551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 171112561 + 1380568336 = 13081^2 + 37156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551680897 - 2¹⁰ = 1551679873 is a prime.

It is a super-2 number, since 2×1551680897² = 4815427212229449218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551680807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59680022 + ... + 59680047.

It is an arithmetic number, because the mean of its divisors is an integer number (417760245).

Almost surely, 2^1551680897 is an apocalyptic number.

It is an amenable number.

1551680897 is a deficient number, since it is larger than the sum of its proper divisors (119360083).

1551680897 is a wasteful number, since it uses less digits than its factorization.

1551680897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119360082.

The product of its (nonzero) digits is 604800, while the sum is 50.

The square root of 1551680897 is about 39391.3809988937. The cubic root of 1551680897 is about 1157.7127186891.

The spelling of 1551680897 in words is "one billion, five hundred fifty-one million, six hundred eighty thousand, eight hundred ninety-seven".