1921550537 has 2 divisors, whose sum is σ = 1921550538. Its totient is φ = 1921550536.

The previous prime is 1921550483. The next prime is 1921550539. The reversal of 1921550537 is 7350551291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1748996041 + 172554496 = 41821^2 + 13136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921550537 is a prime.

Together with 1921550539, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921550537.

It is not a weakly prime, because it can be changed into another prime (1921550539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960775268 + 960775269.

It is an arithmetic number, because the mean of its divisors is an integer number (960775269).

Almost surely, 2^1921550537 is an apocalyptic number.

It is an amenable number.

1921550537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921550537 is an equidigital number, since it uses as much as digits as its factorization.

1921550537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 1921550537 is about 43835.4940316634. The cubic root of 1921550537 is about 1243.2274872859.

The spelling of 1921550537 in words is "one billion, nine hundred twenty-one million, five hundred fifty thousand, five hundred thirty-seven".