1651331561 has 8 divisors (see below), whose sum is σ = 1826826048. Its totient is φ = 1480066000.

The previous prime is 1651331557. The next prime is 1651331573.

1651331561 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1651331561 - 2² = 1651331557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651334561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056410 + ... + 1057971.

It is an arithmetic number, because the mean of its divisors is an integer number (228353256).

Almost surely, 2^1651331561 is an apocalyptic number.

1651331561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1651331561 is a deficient number, since it is larger than the sum of its proper divisors (175494487).

1651331561 is a wasteful number, since it uses less digits than its factorization.

1651331561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114463.

The product of its digits is 8100, while the sum is 32.

The square root of 1651331561 is about 40636.5791006084. The cubic root of 1651331561 is about 1181.9835357107.

The spelling of 1651331561 in words is "one billion, six hundred fifty-one million, three hundred thirty-one thousand, five hundred sixty-one".