13151961 has 6 divisors (see below), whose sum is σ = 18997290. Its totient is φ = 8767968.

The previous prime is 13151951. The next prime is 13151977. The reversal of 13151961 is 16915131.

It can be written as a sum of positive squares in only one way, i.e., 8156736 + 4995225 = 2856^2 + 2235^2 .

It is not a de Polignac number, because 13151961 - 2⁷ = 13151833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13151911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 730656 + ... + 730673.

It is an arithmetic number, because the mean of its divisors is an integer number (3166215).

Almost surely, 2^13151961 is an apocalyptic number.

It is an amenable number.

13151961 is a deficient number, since it is larger than the sum of its proper divisors (5845329).

13151961 is a wasteful number, since it uses less digits than its factorization.

13151961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461335 (or 1461332 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 13151961 is about 3626.5632491382. The cubic root of 13151961 is about 236.0461044178.

The spelling of 13151961 in words is "thirteen million, one hundred fifty-one thousand, nine hundred sixty-one".