961506109 has 2 divisors, whose sum is σ = 961506110. Its totient is φ = 961506108.

The previous prime is 961506061. The next prime is 961506131. The reversal of 961506109 is 901605169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 873202500 + 88303609 = 29550^2 + 9397^2 .

It is an emirp because it is prime and its reverse (901605169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961506109 - 2⁷ = 961505981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961506149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480753054 + 480753055.

It is an arithmetic number, because the mean of its divisors is an integer number (480753055).

Almost surely, 2^961506109 is an apocalyptic number.

It is an amenable number.

961506109 is a deficient number, since it is larger than the sum of its proper divisors (1).

961506109 is an equidigital number, since it uses as much as digits as its factorization.

961506109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 961506109 is about 31008.1619739062. The cubic root of 961506109 is about 987.0004468764. Note that the first 3 decimals are identical.

The spelling of 961506109 in words is "nine hundred sixty-one million, five hundred six thousand, one hundred nine".