191961037 has 2 divisors, whose sum is σ = 191961038. Its totient is φ = 191961036.

The previous prime is 191961031. The next prime is 191961053. The reversal of 191961037 is 730169191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178863876 + 13097161 = 13374^2 + 3619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191961037 is a prime.

It is a super-2 number, since 2×191961037² = 73698079452230738, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 191960987 and 191961005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191961031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95980518 + 95980519.

It is an arithmetic number, because the mean of its divisors is an integer number (95980519).

Almost surely, 2^191961037 is an apocalyptic number.

It is an amenable number.

191961037 is a deficient number, since it is larger than the sum of its proper divisors (1).

191961037 is an equidigital number, since it uses as much as digits as its factorization.

191961037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 191961037 is about 13855.0004330567. Note that the first 3 decimals coincide. The cubic root of 191961037 is about 576.8608016149.

The spelling of 191961037 in words is "one hundred ninety-one million, nine hundred sixty-one thousand, thirty-seven".