1551717161 has 4 divisors (see below), whose sum is σ = 1552540500. Its totient is φ = 1550893824.

The previous prime is 1551717113. The next prime is 1551717191. The reversal of 1551717161 is 1617171551.

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 1168340761 + 383376400 = 34181^2 + 19580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551717161 - 2²⁶ = 1484608297 is a prime.

It is a super-2 number, since 2×1551717161² = 4815652295483799842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551717191) 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, 408836 + ... + 412613.

It is an arithmetic number, because the mean of its divisors is an integer number (388135125).

Almost surely, 2^1551717161 is an apocalyptic number.

It is an amenable number.

1551717161 is a deficient number, since it is larger than the sum of its proper divisors (823339).

1551717161 is an equidigital number, since it uses as much as digits as its factorization.

1551717161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823338.

The product of its digits is 7350, while the sum is 35.

The square root of 1551717161 is about 39391.8412999443. The cubic root of 1551717161 is about 1157.7217375037.

The spelling of 1551717161 in words is "one billion, five hundred fifty-one million, seven hundred seventeen thousand, one hundred sixty-one".