1361641651 has 4 divisors (see below), whose sum is σ = 1365755704. Its totient is φ = 1357527600.

The previous prime is 1361641649. The next prime is 1361641657. The reversal of 1361641651 is 1561461631.

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

It is a cyclic number.

It is not a de Polignac number, because 1361641651 - 2¹ = 1361641649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361641657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056530 + ... + 2057191.

It is an arithmetic number, because the mean of its divisors is an integer number (341438926).

Almost surely, 2^1361641651 is an apocalyptic number.

1361641651 is a deficient number, since it is larger than the sum of its proper divisors (4114053).

1361641651 is an equidigital number, since it uses as much as digits as its factorization.

1361641651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114052.

The product of its digits is 12960, while the sum is 34.

The square root of 1361641651 is about 36900.4288728465. The cubic root of 1361641651 is about 1108.3772655069.

The spelling of 1361641651 in words is "one billion, three hundred sixty-one million, six hundred forty-one thousand, six hundred fifty-one".