999961537 has 2 divisors, whose sum is σ = 999961538. Its totient is φ = 999961536.

The previous prime is 999961511. The next prime is 999961541. The reversal of 999961537 is 735169999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 773729856 + 226231681 = 27816^2 + 15041^2 .

It is a cyclic number.

It is not a de Polignac number, because 999961537 - 2¹⁹ = 999437249 is a prime.

It is not a weakly prime, because it can be changed into another prime (999961577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980768 + 499980769.

It is an arithmetic number, because the mean of its divisors is an integer number (499980769).

Almost surely, 2^999961537 is an apocalyptic number.

It is an amenable number.

999961537 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961537 is an equidigital number, since it uses as much as digits as its factorization.

999961537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4133430, while the sum is 58.

The square root of 999961537 is about 31622.1684424076. The cubic root of 999961537 is about 999.9871788356.

The spelling of 999961537 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred thirty-seven".