915961997 has 2 divisors, whose sum is σ = 915961998. Its totient is φ = 915961996.

The previous prime is 915961987. The next prime is 915962009. The reversal of 915961997 is 799169519.

915961997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 899160196 + 16801801 = 29986^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 915961997 - 2⁶ = 915961933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (915961957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 457980998 + 457980999.

It is an arithmetic number, because the mean of its divisors is an integer number (457980999).

Almost surely, 2^915961997 is an apocalyptic number.

It is an amenable number.

915961997 is a deficient number, since it is larger than the sum of its proper divisors (1).

915961997 is an equidigital number, since it uses as much as digits as its factorization.

915961997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1377810, while the sum is 56.

The square root of 915961997 is about 30264.8640670993. The cubic root of 915961997 is about 971.1637985054.

The spelling of 915961997 in words is "nine hundred fifteen million, nine hundred sixty-one thousand, nine hundred ninety-seven".