921194375537 has 2 divisors, whose sum is σ = 921194375538. Its totient is φ = 921194375536.

The previous prime is 921194375417. The next prime is 921194375561. The reversal of 921194375537 is 735573491129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686496759601 + 234697615936 = 828551^2 + 484456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921194375537 is a prime.

It is not a weakly prime, because it can be changed into another prime (921194375237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460597187768 + 460597187769.

It is an arithmetic number, because the mean of its divisors is an integer number (460597187769).

Almost surely, 2^921194375537 is an apocalyptic number.

It is an amenable number.

921194375537 is a deficient number, since it is larger than the sum of its proper divisors (1).

921194375537 is an equidigital number, since it uses as much as digits as its factorization.

921194375537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 56.

The spelling of 921194375537 in words is "nine hundred twenty-one billion, one hundred ninety-four million, three hundred seventy-five thousand, five hundred thirty-seven".